The humor is silly and mostly immature, it's not really my cup of tea either, the jokes hardly ever made me laugh but they did make me cringe on occasion - and still I had lots of fun with playing SR3. That the game doesn't take itself seriously and exaggerates everything it does is part of why it's popular and well-liked, but not the only (or even the main) reason why it's good. It's also pretty fun to play because of the smooth gameplay, the rich customization, the light-hearted sandbox style. It's not the game to buy if you're looking for a good story-telling experience with a mature and gripping plot, interesting and likable characters and clever humor. But it's the best for just toying around, and you could end up loving it despite disliking story and humor, just because the gameplay is so much fun. It also has lots of upgrades to keep you motivated, and a RPG-like reward system.
Besides, the humor plays a role on more than one level. While I didn't care much for most jokes, I rather liked the variety of absurdities that the game comes up with and how it integrates them into the gameplay.
If you decide to give it a chance, don't give up just after the two tutorial missions - the tutorial demonstrates all that you might find annoying about the game without letting you do what you might enjoy most. I nearly made that mistake, but once I got to play the game the way I liked and had some time to get accustomed to the intentionally bad taste, I was hooked. I played through it pretty quickly, and before, I would never have guessed that I'd be even interested in it.
I also tried SR2 and it seemed very similar but didn't feel as smooth and polished as SR3, presumably due to a bad PC port. Driving cars was awesome in SR3, a pain in the ass in SR2. So I'd advise against buying the PC version, because driving is an essential part of SR.
Post edited April 16, 2014 by Leroux