These are my top few in no particular order:
Diablo II
Ocarina of Time – i’ve beatn this game easily 9 or 10 times. Biggoron’s sword ftw.
Golden Eye
Super Smash TV
Super Smash Bros (the original)
Golden Axe
Streets of Rage 2
Half Life 1 and 2
Chrono Trigger
those were just the few that came to mind. I love mah games.
edit: honorable mentions:
System Shock 2, Forsaken 64, Duke Nukem, Quake 2, Star Fox, TMNT 4 turtles in time