The Last of Us is certainly an incredibly well done game that cause you to go through a whole gamut of emotions. Joel and Ellie's adventure really struck a nerve with a lot of gamers and Naughty Dog really produced a top notch experience with the game. It also helped that they got some great voice actors to make the characters even more likable.
Sony has released a documentary talking about the developing The Last of Us. Developing a new IP is a scary, scary process and you'll get to see and hear many of what Naughty Dog had to go through to make this game. You'll probably want to wait until you finish it before you watch it as there will be a ton of spoilers. It's a great watch to not only see how they made the game but what goes into making a game in general.