Super Mario 3
Perfect Dark
Doom 2
Starsiege (best mecha game ever created)
Homeworld (1 for epicness, 2 modded for strategic awesomeness)
Half Life 2
Left 4 Dead
Jedi Outcast
Supreme Commander
Mechwarrior (2 for authenticity, 3 for graphics, 4 for online gameplay)
EDIT: I’m going to cheat and put 11. I just have to include the best time waster of all time:
Chip’s Challenge