I would say God of War Origins Collection, best story of the God of War games (especially Ghost of Sparta) plus it's two games for one price. God of War 3 is also great for the PS3 if you LOVE killing things. The only thing is that there is partial nudity in the games, so just be careful about playing it around your family.
Assassin's Creed is a great game, but it's a different style of killing than God of War(obviously). It has an immersive story too. It just depends on if you want to kill specific targets/people like an assassin then Assassin's Creed is for you, if you want to use godly weapons to slice your enemies in half and kill everyone, and I mean everyone, then God of War is for you.
For story elements Definitely the Uncharted Series. And you kill people too.
But ultimately Uncharted has probably one of the best storyline of this generation as well as being one hella beautiful game.
Another pick would probably be Bioshock, which can either be one of those stories that makes no sense to you or another brilliant tale providing you find all the Audio Logs.