Damn. I was a bit worried about this game. Not that I thought it would stink, but I was getting my expectations set pretty high before playing it. That's usually a recipe for disaster, but not in this case. The game is freaking awesome.
I played through the single player campaign in about 10 hours. There is also a 2-player co-operative campaign that Chey and I will be playing soon. The game was a great combination of the awesome puzzle play that made the first one so great, with the addition of a bunch of new puzzle elements, another character in the game, and a nicely twisted story-line. There were also lots of tidbits here and there explaining the whole back story of Aperture Science and GLaDOS.
The game was very nicely paced as well. There were plenty of fast-action sections where you had to make quick shots with your portal gun, or dodge crushing spiked plates, but they were well-balanced with plenty of times where I just had to sit and ponder how to get my way through a puzzle. I died a bunch of times, but for the most part I never really got stuck. There were a lot of puzzles that really got me thinking, forcing me to come up with news ways of using cubes, funnels, momentum and force fields.
The game makes you think, but its got quite the sense of humor. GLaDOS has the same voice from the original, and the other character, Wheatley, is voiced by Stephen Merchant whom you may remember from the Science Channel series An Idiot Abroad. I laughed plenty, but I haven't come across any cake references like I was expecting too. Oh well, maybe in the cooperative campaign.
All in all, I highly recommend this game to anyone who likes puzzle games, the original Portal, or pretty much any game I guess. I think it's out for Xbox 360, PS3 and PC. So, buy it, GameFly it, or borrow it, you will enjoy it.
Oh, and I guess I would rate it a 9.5 out of 10.
Yep, everyone I've talked to whose played it has loved it. And I haven't even played the two-player co-op mode yet.