Well, i can't decide, so i'll post some of my favorite games:
Jet Force Gemini
Perfect Dark
Goldeneye 007
Mario Kart 64
SSB (n64, melee and brawl)
TLoZ: OoT, MM, WW.
Fire Emblem (6, 7, 8, 9 and 10)
Kirby (64, Air Ride)
Star Fox (64, Assault)
Advance Wars (GBA, Black Hole Rising, DS)