In no particular order:
Fallout (1, 2, and 3) [ Is it weird that I played them out of order? 3,1, then 2 ]
Oblivion
Resident Evil REmake (This game is a fricking masterpiece!)
Castlevania: Symphony Of The Night (Masterpiece part Deux)
Super Mario Kart (The original shall never die and the DS version is pretty good.)
Marvel Super Heroes
Marvel VS Capcom 2
Final Fantasy VI (I just can't get enough!)
Streets of Rage 2 and 3 ( a.k.a. Bare Knuckle 2 and 3)
That's all I can think of off the top of my head.