I'm a little late to the table with this one and its also the first game I've bought on the PS3 for sometime. Having just finished it, I'm totally blown away by how incredible an experience it is, if this doesn't pick up every game of the year award and everything in between I'd be shocked.
It's the story and character development that really nails it. Yes it borrows a lot from zombie films and post-apocalyptica fiction such as The Road, The Walking Dead, Half-Life, 28 Days Later etc.... but it does enough to make everything its own, so it never feels like its just a poor imitation of something else. The surrogate Father/Daughter relationship between Joel and Ellie builds so well and does a better job than most films in terms of character development.
I also loved the score, as it is so simple, yet quite haunting and perfectly reflects the beauty of the world, yet the sad undertone of it being desolate. I thought it sounded familiar, so was interesting to see from the credits that its by the same guy who won the Oscar for Brokeback Mountain.
I've preordered an Xbox One, but if a sequel comes out as a PS4 exclusive, I'd be buying one in a heartbeat.
Incredible game.