PORTAL 2: The single player campaign was very awesome, and the single player campaign is the first in the order of the story; I suggest you finish it before playing the Coop storyline, to understand it better. Now, Coop was an awesome experience - I haven't had this much fun in multiplayer... ever!
STORY AND CHARACTERS: There is a wonderful story going on - showing the emotions of the character GlaDos and the strange robots, P-body and Atlas. These two robots are the ones you play as during the Coop campaign, and GlaDos will occasionally whisper to one character individually and tell them that they are doing better or worse than the other player, tell them that the other player is plotting against them, etc.
QUALITY: It's a lot of fun and it's hilarious, just like the normal mode; however, I think the dialogue in the normal mode is much better - but this Coop campaign still stands as one of the best campaigns I've ever played - multiplayer OR single player.
COOPERATIVE: This campaign requires you to work together on everything; it was made fully for multiplayer, separately from the single player, which is clearly made for one player only. Having another player there doesn't make it easier; both players still have to spend a lot of time trying to figure things out, before they can get anywhere. They have to collaborate on everything or fail at everything.
THOUGHTS: I don't think there is a way to make the game better than they have; it is simply above and beyond my expectations for the Coop mode. The ending was awesome, and you'll love it when you play. The story doesn't seem very big, but the end changes everything for Aperture Science, humanity and... you might even save the thing that GlaDos loves the most...
OVERALL: This Coop campaign was awesome and you really should get Portal 2 as soon as you can! Or if you can't afford it, now, then it really doesn't matter. Valve always has sales every couple of months on their games on Steam, making them sometimes about 20% of their original price. As for 360, you can just buy a used copy from someone else - but for the PS3, you activate your game through Steam, so I don't believe you can return the game - but you get the PC and MAC versions of Portal 2 for FREE if you buy the PS3 version, so it might be worth it if you want it on more than just PS3.
SCREENSHOTS FROM SINGLE PLAYER - PART 1
SCREENSHOTS FROM SINGLE PLAYER - PART 2
SCREENSHOTS FROM MULTI PLAYER - PART 1
SCREENSHOTS FROM MULTI PLAYER - PART 2
REVIEW OF SINGLE PLAYER CAMPAIGN
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