I'd have to say..
Final Fantasy VII
GTA3
UT
Super Mario RPG
GTA: San Andreas
Halo 2
Halo
Crimson Skies
Most of these are fairly new games but they're pretty amazing to me. Vice City was fun but when I think about it... GTA3 was groundbreaking, and Vice City was a huge improvement... but now that I play San Andreas, Vice City seems like nothing. I think it kind of overshadows it. FF7 has always been my favorite game of all time though. Yeah, I know, most of mine are console games.
Final Fantasy VII
GTA3
UT
Super Mario RPG
GTA: San Andreas
Halo 2
Halo
Crimson Skies
Most of these are fairly new games but they're pretty amazing to me. Vice City was fun but when I think about it... GTA3 was groundbreaking, and Vice City was a huge improvement... but now that I play San Andreas, Vice City seems like nothing. I think it kind of overshadows it. FF7 has always been my favorite game of all time though. Yeah, I know, most of mine are console games.