Try Super Monday Night Combat, free to play - great Third Person Shooter that is actually a full MOBA Tower Defense game. Updated with new content every week, looks a little similar to TF2 but is nothing like it in gameplay.
The UberEntertainment forums are super active and will help you learn this game which has a very steep learning curve just like all moba's do:
Supports Steam Trading and Friends List - awesome game check it out!
Before anyone recommends anything, look at the ****ing GPU please
Hey, what's with the negativity? So far it works decently enough for the games I've tried out on it. Sure, it's not going to run bleeding edge top of the line games, but those aren't what I'm looking for anyways.
Anyways, I appreciate all the suggestions so far, guys. Keep em coming!
It's integrated graphics. That'll pretty much bottleneck you on anything with decent looking 3D graphics.
I know it's integrated graphics; thanks for stating the obvious. However, I disagree with your idea that it can't perform well with 3D; it can and does. As I said, I know it won't handle the super high end 3D, but it's good enough for most things.
For future reference, any of you who just has negative crap to post can feel free to not post at all. I'm not looking for snobby douchebag attitudes about how my computer doesn't meet your standards; if you don't have any games to suggest, then shut up.