Fallout: New Vegas (PS3, Xbox 360, PC)

I liked it a lot better than Fallout 3, but that's not really saying a whole lot, as I wasn't exactly fond of it.

 

This, pretty much.

Although (as Invidious rightly points out) Fallout 3 was a damn-near-perfect game, New Vegas has only grown on me since it first came out. Much like Red Dead Redemption massively improved upon virtually everything done in GTA IV, New Vegas sticks to your ribs even better than FO3, which is saying something.

Already played through it twice, and will be playing through it a third time, probably this summer.