Since Nicole28 asked to make a favorite genres thread, it shall be. So GOG what are your favorite genres. here our mine in order.

2d/3d platformers:
This is easily my favorite because hey I grew up with the Super Nintendo. I know some of you roll your eyes when you see a new indie platformer appears on GOG but I really can't get enough of them. My favorite platformer and game of all time is Donkey Kong Country 2. Amazing level design, great controls, nice bosses, collectables to get 100 percent (or 102 percent as this game calls it) and damn that soundtrack is incredible. I will give a bonus mention to Treasure Adventure Game because that was a nice surprise from GOG last year. Even though you had to play with the compatibility settings for some odd reason and some of the last part of the game felt rushed but I still say it is the best free game on GOG. That's right come at me

Note: you don't necessarily have to explain what your favorite game in a the genre is I just did because it helps explain why I like it so much as DKC 2 has everything I love in platformers done flawlessly in one game.

RPG's:
It must be hard to have a GOG account and not like rpgs, hell that is like living in Canada and not liking hockey.
Now when I say rpgs I mean both crpgs and jrpgs. That's right I like both and yes something must be very wrong with me. I grew up with jrpgs and I got into crpgs because of GOG with games like Fallout, Baldur's Gate and Neverwinter Nights well done GOG

FPS:
The reason I came to GOG was because it had UT GOTY so that is a pretty big indicator. I tend to like a fps that is wacky and doesn't take itself too seriously and has ridiculous weapons like Serious sam or Painkiller, but that doesn't mean I can't play a realistic one, I just prefer the other ones more

That's all I can think of so it's your turn now. What are your favorite genres.

Adventure (Day of the Tentacle)
FPS (BioShock)
Puzzle (Braid)

Favourites are in brackets.

RPGs is my favourite genre and mostly single player ones.(Gothic series, Diablo 1+2), Divine Divinity and many more.

RPG, Point-and-Click, Action (-Adventure), Platformer (2D & 3D), Puzzle. I think these genre names, on their own or in combination with each other, are vague enough to include almost anything I like. ;)

Although whether I like a game or not is more dependent on the game's merits themselves than on its genre, of course. There are some pretty boring RPGs and P&Cs and very bland or clunky platformers, while I like lots of games that are hard to classify.

Is Tomb Raider a genre? It should be. That's my favorite.

RTS, Adventure (Ponit-and-Click) and of course...

RPGs. I love them, really. I played every RPG released for the PC so far (at least I like to believe so) and my favorite is still Gothic II + DNdR, followed by KotOR and Morrowind.
The story, the gameplay, the atmosphere, you cannot compare any other genre to this feeling.
There are exceptions of course, on both sides.

Western RPG's that aren't Diablo or roguelikes: the Baldur's Gates, Planescape: Torment, Neverwinter Nights 2, Icewind Dale, Fallout 1 and 2. Action RPG's are a bit hit-and-miss, with things like The Witcher keeping up my interest when Fallout: New Vegas and other bitter disappointments are busy at discouraging me.

I generally like turn-based strategy games, and, by extension, most tactical RPG's. By this I mean games like Fire Emblem, Front Mission, Jagged Alliance. I'm pretty bad at real-time strategy, but if you throw in some RPG elements (and often soften the strategizing a bit as a result), I'll be all over it: I liked SpellForce 2 and loved Ogre Battle 64, and Divinity: Dragon Commander if you can really count it as one.

...and that's about it. Not that I don't like other games as well, but usually there are too many sour apples to really justify saying that I like a given genre.

RPGs with great combat, like Baldur's Gate or Mass Effect.

Games with interesting open worlds, like The Elder Scrolls or GTA.

Turn based strategy games, like Civilization or Alpha Centauri.

RPG, SRPG (ie Disgaea), strategy (both real time and turn based).

Turn-based Strategy. Master of Orion remains on my top 10 of all time. I also have a fondness for HoMM-alikes.

I like some RPGs, mainly those where A) I can roll my own character instead of having to use preset ones, and B) the combat is turn-based. Real-time combat I'm usually OK with only if it's a hack & slash with one character rather than a party.

I like some FPSs, mainly the old guard (before Half-Life.)

Platformers are too vast a category to like or dislike as a whole, but some of my favorites come from this category.

RPG (no definite "game I like the most"; some of the favourites are Planecape: Torment, Vampire the Masquerade: Redemption, Gothic 1-3, Morrowind, Witcher. What matters most to me is the world and the story of your character.)
TBS (Disciples 2, Heroes of M&M.)
Stealth/action (not certain about the definition) games (Hitman, Dishonored, Deus Ex. I like the very idea of completing the missions so that it seems as if everything happened by itself, accidently, with no interference from anyone).
RTS (Stronghold 1+Crusader, Spellforce, Praetorians. OK, I know those aren't pure RTS, but they do have RTS elements).
FPS (Half-Life, Max Payne. Have you ever wanted to shoot the bad guy while watching a movie? Well, you can do this here).
But honestly, it's hard to say "I like this genre" or "I like that genre". It most often comes down to particular games and it's no easy matter to generalize my tastes.

Platformers, RPG, and FPS... with some heavy qualifications. As I alluded to in the genres-you-hate thread, there are a lot of subgenres that I really don't like.

Platformers - I love action platformers and Metroidvanias, especially the difficult ones. Super Metroid, Super Ghouls n' Ghosts, Megaman X, Mario 64, the original Ninja Gaiden, Castlevania IV - the list goes on. I don't particularly like puzzle platformers, which is why I don't usually care for indie releases in this genre. There are a few that I enjoy, like The Lost Vikings, but TLV was a breath of fresh air in its time. If every platformer after it had tried to copy it, I'd have gotten sick of platformers pretty quickly.

There is a certain breed of "puzzle platformer" that I really enjoy, though - that being the Tomb Raider / Prince of Persia style.

I had a falling-out with platformers during the PSX / N64 era. There were a number of attempts to bring platforming action into 3D, but the vast majority fell flat on their face. Mario 64 showed everybody how to do it, but nobody listened.

Recent platformers I've really enjoyed are Bleed, Volgarr the Viking, and They Bleed Pixels. Valdis Story looks pretty good, too.

RPG - I like the OLD-school turn-based western RPGs in the Wizardry, Gold Box, and Might and Magic mold. Create a full party of adventurers and go solve your epic quest. No predefined characters to stifle your party builds, and not a lot of story or talking to get in the way - though the Dark Savant trilogy proves that you can tell an involving and incredibly epic story without compromising gameplay. Just you, your characters, and a seemingly impossible sea of monsters, traps and riddles.

I like some of the "new old-school" RPGs, such as Fallout and Baldur's Gate 2, sometimes quite a bit (though I detest the Infinity Engine itself). I just miss my kind of RPGs, because there aren't too many of them being made anymore. I don't like roguelikes at all. Most JRPGs just make me impatient and bored, because they tend to have pretty weak gameplay broken up by a LOT of cut scenes and talking.

Some fine recent examples include Temple of Elemental Evil, Frayed Knights, and Swords and Sorcery: Underworld.

FPS - My favorite here is the proper classic-era FPS, where you run 30 miles an hour through an intricate maze and carry an arsenal of ridiculous weapons to deal with an army of bad guys. Doom, Duke, Blood - my favorites here are no real surprise. I also like some of the late-90s / early 2000s FPS such as Deus Ex, System Shock 2 and No One Lives Forever, which put new spins on first-person gameplay while still having, you know, gameplay.

The only recent game I've played that really made much of a go at doing this right is Rise of the Triad, which of course has its own set of flaws and failings. Wrack looks promising, though.

Honorable mention - Thief. One of my favorite game series of all time - but I can't really say that stealth games in general are a big favorite of mine, just because most of them just plain suck compared to Thief.

Well said. I am terrible at stealth games and tend to avoid them but the Thief series seems to give you just enough leeway. I think it might have something to do with your options at being stealth; most games are 'go here or be seen' whereas in Thief you have so many different avenues.

My favorite genres are:

Turned Based Strategy and Turned Based Tactical.
The games I have spent the most time on are Master of Orion 2 on PC and the Advance Wars series on Nintendo handheld. Advance Wars is why I bought my first Gameboy to begin with.

Adventure Games.
Another turned based type of games. My first one was Scott Adams' "The Count" on my VIC-20. My all time favorite is Gabriel Knight 3.

Real Time Strategy
Dune 2, the Command and Conquer series up to Red Alert 2, Warcraft 1 and 2. I've played most of those several times.

And in any genre, I prefer a science fiction setting to fantasy one.

Fact. Most of the missions in Thief are fairly non-linear and open, giving you a variety of options for how you tackle your objectives, which in turn impacts the situations you find yourself in and the moment-to-moment challenges you have to overcome. The game mechanics are also quite sophisticated for their time, or even for this time, heavily emphasizing planning, observation, and patience.