Well, I'm a WipEout boy at heart and this was the last year that we got a mainline entry (2048), so I would vote for that :)
I also oddly liked PlayStation All-Stars Battle Royale. Everyone hated it, but I had a lot of fun with it.
Starhawk was also good and LittleBigPlanet (Vita). I was pretty much only gaming on my Vita and PS3 in 2012.