My first recommendation would be Skyrim. I bought that at the end of 2011 and until a month or so ago it didn't come out of the PS3. Absolutely the most addictive game I've ever played...I could spend an entire day playing it, but I can equally pop into it for an hour or two.
The Assassin's Creed games are excellent as well. The first one gets you used to the controls and game-style, but doesn't really last too long. The second is the best one I feel...great story, very involving. Wasn't too bothered about the third, (Brotherhood), but am quite liking the fourth, (Revelations).
I've only played one Uncharted game...the second I think it was. Very good.
(No doubt you're seeing a theme...third person adventures.)
Did you want to buy a Steering Wheel to give GT5 a bit of a boost? I bought one when I got GT5 and it's pretty good.