I guess I'll make a list, but a lot of you beat me to a lot of them.
No particular order. All time favorites in Bold w/ Picture.
1. Super Mario Sunshine (Gamecube)
2. Banjo Kazooie (N64)
3. Conker Live & Reloaded (XBOX)
4. Diddy Kong Racing (N64)
5. Marvel Vs. Capcom (PS1)
6. Toy Story 2 (PS1)
7. Most of the Mortal Kombat Series (N64, XBOX, Gamecube, PS2)
8. Bioshock (Xbox 360)
9. Fable 3 (Xbox 360)
10. Borderlands (Xbox 360)
Honorable Mentions
Super Mario 64
Mario Kart 64
Pokemon Yellow, Red, & Blue
Super Mario 3
Pokemon Stadium
Halo 3
Fallout 3
Yoshi's Story
Banjo Katooie
GTA: San Andreas
Proud Owner of over 14 game systems and 100+ games. Sad I Know.