This isnt a overall top ten (maybe a few more), just a personal one, ranked because ive personally had the most fun playing these games.

in no particular order:

Star Fox
Super Smash Brothers Series
Diabo 2
Counter Strike 1.6 + Source
Team Fortress Two
Super Mario 64
Mario Kart N64
Battlefield 1942

easy to tell which decade i grew up in ^.^