I think its good to do a mixture of graphically demanding games and older games/games that aren’t graphically demanding.
I would seriously suggest looking at playing games like Day of Defeat, Call of Duty (original), Counterstrike 1.6, Quake 3, etc as most any computer on campus can play them yet they are still good, fun, competitive games. I’m not taking away from games like CSS, L4d, TF2, etc cause I love those games but I think PC capabilities is what keeps a lot of people from playing them.