Battlezone (and 2) on the pc, fighting on the moon in the late 90s was sublime.
Psychonauts, never got the recognition it deserved.
Full throttle - old skool point and click action.
Bully - first game to do something worthwhile with the wii.
Freespace 2 - the final hallejujah of the space combat simulator, xwing, tie fighter you are still missed.
Samba de Amigo on the dreamcast, the cost of it kept it from the mainstream.
The punisher - garth ennis inspired mayhem.
Eternal darkness.
Death tanx, the dreamcast, 7 player original is still best, the 360 version a worthy successor.
If anyone is a fan of the original battlezone one of the original creators is still updating the game and releasing it with updates for windows 7. Love it.