Much like the first game, the story and humor are on point in Portal 2. Wheatley is a great counterpart for GLaDOS. The mechanics are substantially expanded from the first game with the various types of goo, and I enjoyed the variety of new puzzles that provided.

The intro to the game really drags on, though, with lots of incredibly easy puzzles and loading screens. I would have preferred if it jumped into more challenging puzzles much more quickly. I liked the general idea of the non-puzzle areas, but I did get a bit tired of hunting around for the little bit of wall that I could put a portal on.

Those are just minor complaints, though. While Portal 2 isn't necessarily a personal favorite, I can see why it's generally rated among the best games of all time.