My god some people here are impossible to please. Portal 2 is one of the finest pieces of media I have experienced. It's a good game, has a great story, excellent dialogue. I haven't laughed this much at anything sober in forever. Also, the ending was excellent. The whole thing reminded me of a playable Pixar movie. And the animations, the sense of scale, it's just a damn good game.
Yup, Portal 2 is just a really good, well polished game.