CoD4, solely because of the amazing online
Mass Effect/KotOR
Banjo-Kazooie/Tooie/NaB
Dude. I can't believe I forgot BK/BT.
Best platformers EVAR.
Also, every Legend of Zelda EXCEPT Link's Adventure. That game was horrifically bad.
[Edited by Sonimon, 12/5/2008 7:24:14 AM]