For me personally, it would have to be the Last of Us. The story was incredible. Loved the relationship between Joel and Ellie, and I really started to care for the characters (Really loved Henry and Sam too!) I also enjoyed the gameplay. It was fun to sneak around and quietly execute your enemies, but time to time I would get caught and have to end up killing them in a firefight, which was cool too because of the lack of ammo.
I found myself having to scavenge ammo from environments/dead people whilst trying to hide from survivors who were already after me. Very tense, especially on survivor where almost every firefight you found yourself having no ammo or really low health and no bandages to heal yourself.
Just a really incredible game. Was sad to see it finish...But it did have a very surprisingly amazing multiplayer! Had a ton of fun with that too. Naughty Dog is awesome ^^
Edit - Also, Uncharted 3 blew me away graphically! I played it after playing TLOU, and didn't think it could look any better but WOW...Uncharted 3 is the best looking game I've ever played. Especially when you first uncover that city and you walk down the stairs whilst looking at the big view of the city. I actually said "wow" in real life because it just blew me away. I know it's not all explorable...but it looked epic nonetheless.