Crikey...Hard to think back. For me it'd probably be in no particular order
Assassin's Creed Revelations, Brotherhood and 2
Legend of Zelda: Twilight Princess
Force Unleashed
Sleeping Dogs
CoD: Modern Warfare 1
Red Dead Redemption
GRAW 2
Alan Wake
Ballad of Gay Tony
If there's one game I would've liked to have played but never had the console to do it it would probably be Heavy Rain which would've probably went on my list as it really seemed up my street.
Revised list. In no particular order:
Mass Effect 3
Red Dead Redemption
Portal 2
Crysis 2
Battlefield 3
Bioshock
Gears of War
Uncharted 2
Fallout 3
TF2
Most disappointing:
Super Mario Galaxy 2
Legend of Zelda: Skyward Sword
Crysis 3
Perfect Dark Zero
Rage
Alien Vs Predator
Uncharted 3
Dragon Age 2
Far Cry 2
THE LACK OF HALF LIFE 3
Surprising:
Alan Wake
Batman: Arkham Asluym
Enslaved: Oydssey to the West
Hotline Miami
Super Meat Boy
LA Noire
Prey
Rainbow Six Vegas