"Shadow of the Colossus/Ico in HD" are incredible & are forever re-playable plus there now cheap!!! Plus there are quite a few PSN only games that can be downloaded direct to Hard Disk that are worth grabbing like "Tekken 5 Dark Ressurection Online" & also "SEGA Rally Online Arcade" is a great classic... "The Darkness" (Trial) is awesome so look for that when its released next month!
Red or Dead Redemption, Skyrim, GTA. I also like Black Ops but at least ten people will mock this as its a marmite game. personally i would avoid MW3 i thought it was a stinker. MW2 was the best one IMO. also loved Resident Evil 5. enjoy!
Red Dead Redemption, Mass Effect 2 + 3, Metal Gear Solid: Guns of the Patriots, GTA IV: Ballad of Gay Tony, Just Cause 2, Arkham City, Super Street Fighter 4, Shift 2: Unleashed. And I'll probably get grief for this one, but Pro Evolution Soccer 2012 as well :p Undeniably flawed, but when it's at its best, is much more enjoyable than FIFA in my (humble) opinion.