This is a place where gamers can come and tell of their favorite games, discuss current games, head up gaming contests, and join in on online games that others are playing. It's a place run by gamers and enjoyed by all types of gamers alike.
I like the theater part the best. I think it is really cool how you can replay games and pause right when you make a good kill. For example, I was playing a friend and he shot me with a rocket launcher. On playback, we found out that in fact the rocket went right between my legs and hit the turret behind me, which exploded (and that's what killed me).