Stratagy: KOTOR<-- toly godly. everyone loved it, most in depth best stratagy game ive ever played
RTS: Starcraft & exp<-- like harper said, u dont see too many games 8 years old kickin lan parties, proly cuz this one PWNS!!!
FPS: Counter Strike<-- still huge, CAL CPL, IMO best multiplayer fps ever and still is (even better than source)
MMO: DiabloII<-- i spent proly 4 years on that game, and im sure everyone has loved it at one point. cep tnow ive grown to my sences and only play games that, you know, kinda take skill n stuff