SP, to have some fun
MP, to get frustrated and mad :P

I think I'm doing smt wrong :S

Because I'm Batman. :)

Actually its probably cause I can do things I normally wouldn't be able to do.

EDIT: I also love the feeling in games to be part of something. Like in fallout, saving your vault, or games like Half-Life, playing as the underdog.

Main reason is escapism. Being the main character in a good story, a major force shaping a believable world, at times just to feel Godlike, and when need be to let off steam in ways I most definitely couldn't use in "real life"...

Definitely far better than movies, I very rarely watch any of those, they're completely passive experiences that, unlike books, don't even leave the visuals to your imagination, just spoon-feed your somebody else's view which you have to swallow whole, plus that they're also far less detailed and usually have far worse plots than books anyway.
Music, on the other hand... Until eight years ago I'd have said definitely, but since then, no way.

For the escapism.

Yo this.

Stress relief. I don't really get a chance to play during the week, and I'm mentally exhausted from having to interact with morons all week... :-) ... so now I try to have a "game night" on the weekend; I'll play 6 - 8 hours, drink beer, listen to music. Being of hermetic tendency, I do not get energized from being around people; I get energized by being away from them. Even my woman knows I'm pretty much "off limits" on my gaming night.

And there are games I love just as much as books or movies.

To unwind. To immerse myself in uncharted worlds. To "listen" to a good story. To think. To learn new rules, do my best based on the knowledge and get rightfully rewarded for it (satisfaction I kinda miss receiving in the job).

Reasons differ. I like it isn't passive hobby and it's evolving.
Lately I mostly game and watch only one or two new series that managed to keep my attention. I read books in public tranpsport. I rarely watch a movie. It's almost impossible to find solid one. When I go to cinema to watch "8-10/10" movie, I always expect crappy one (and get it), so I do it for hooking up with friends. I use music only as a background for another activity, it has never been that important to me.
To me, gaming is the most appealing form of art and entertainment, its importance is evident.

Addiction.

I have to be addicited to something to be human and since I don't like the other addictions I fiddled with I simply kept playing pc games.
Oh and it synergizes well with my day job and the free time I have.

I play computer games for fun. Same reason why I read books and watch movies and tv shows. I enjoy all of those in different ways but if I had to drop all those activities except one then I would choose reading.

Well Marzooker !! The question that you asked is very simple I must say that everybody has some reasons to spent time in playing video games. It is the best way to recreate ourselves, my friend I’ll tell you honestly that I play such games just to pass on the time and even to get entertained.

I can't trust NCR, Caesar's Legion and Mr. House with New Vegas, Hoover Dam and Nevada in general. Someone needs to kick their arses out of the desert...

Because I like stories, and every video game I decide to play (whatever the genre is) is a story I can live from the inside. Mind you, from my standpoint even Speedball II (the original one for PC) is a "story" worth trying every once in a while....

For fun, for relaxation and for challenge. And sometimes as a social activity. I greatly enjoy playing video games, far more so than watching movies or TV-shows, and as I'm often a bit too tired to read when I get home, video games suit me just fine. Also, when I'm stressed out, it is nice to just be able to blast some aliens into oblivion.
And finally, I don't get enough challenge in my day to day life, so video games can act as an outlet for that. I'll boot up something that has a challenge that I find interesting and play that. If I did not have this outlet, I would probably be a very frustrated person. Absolutely. Games have surpassed movies for me. I hardly ever watch movies alone these days, because I just get bored. That being said, I can enjoy a really good movie, it just needs to be something exceptional for me to find it worth my time. As for my favourite album? I don't listen to music. I can appreciate music when in a context (i.e. background music in a game/movie/some other activity), but on its own, I don't get anything out of it.

Because they give me the illusion of success which I lack in real life. :P

because my life sucks and my monitor is the only place where something actually happens