There is already a thread for the games you hate so this is one for the games you love.
I have divided it up by system since it is hard to compare between different levels of graphics.
NES: Mario 3 and the Arcade version of Ninja Turtles
Super Nintendo: Super Mario World, Donkey Kong and Donkey Kong 2
Sega Genesis: all the Sonic the Hedgehog games except 3D blast and Pinball, Aladin
N64: Super Mario 64 (my favorite Mario game), Cruisin USA, my favorite racing game, Goldeneye, the best multiplayer game ever, Star Fox, the rumble pack was awesome, Zelda: Ocarina in Time
Playstation: Final Fantasy VII (best game ever), Twisted Metal 2, Resident Evil 2,
Dreamcast: Sonic Adventure 1, Resident Evil Code Veronica, Shenmue 1 and 2, the sports games, with Tony Hawk 2 in particular.
WII: Wii Tennis, Mario Galaxy 1
So what do you all think and feel free to add the other systems, I only included the ones that I have played games from.?