L.A. Noire is my pick! One of the best games I played on the PS3 generation. I thought the story, the 40's setting, the interrogations and even some of the combat scenarios were all excellent. I just wish we could get some sort of sequel! Preferably in the 70's with the Zodiak killer lol
Dark Souls is really good too but, as much as I recognize that it was a step forward for this type of game, I've never liked it as much as Demon's Souls.