Battle Toads
Half-Life and it's mods (especially DoD)
Jet Grind Radio
Unreal(great multiplayer)
Metal Gear Solid(Beat it like 5 times, best story I'd seen for awhile)
Oddworld series
Fallout series(Massive amounts of things to do in those games, so many ways it can go mmmmm)

Avalon: I heard that Pool of Radiance was awful, CGW gave it the coaster of the year award...
I am the Lizard King
I can do anything