Finished playing the single player campaign of Portal 2 recently. Very well done IMO, a very worthy successor to the original. I really do hope that this is not the last game in this particular franchise. Haven't given the multiplayer a whirl yet though, may go back and re-play the original and take another whack at 2 again after that.
This is one of those games that I have no trouble at all recommending folk try. If you liked the original Portal, the sequel should be right yup your alley. I loved the humor, the puzzles and the plot in general. All in all I was very happy with the length of the single-player campaign as well as with the general level of difficulty and fun of the game.
The ending makes a direct linear squeal a bit difficult for Chel of course. However I definitely want to see more games done in this franchise. Heck I would love to see some games done in the past of the Portal universe, either when the facility was more intact or perhaps even a bit further back in time when C.J. was still alive.