Though I played most of my favorites on the PS3, definitely last year.
Dark Souls, Batman: Arkham City, Portal 2, Deus Ex: Human Revolution, Catherine . . . it was a great year.
There just weren't very many memorable shooters, despite this being a generation with a lot of high profile shooters.
In 2010 we had Vanquish, Metro 2033 and Singularity, among others. This year we had The Darkness 2, Spec Ops: The Line, and Binary Domain . . . last year we had, what? Brink? Duke Nukem? Rage? Meh. I'm of course leaving out the usual suspects (e.g. CoD, Gears, Halo, etc.)
I want to say 2007 because of Halo 3's custom games(Which Reach and 4 have failed to live up to, IMO), but I will say 2010 because of Mass Effect 2. God, that game was and still is fantastic to playthrough.