This great game is made even greater as soon as you plug in two extra controllers. Read my short review.
The gameplay is fresh, fun and addictive. I invited two friends over, plugged in two Xbox 360 wire controllers, and within 30 seconds or so, we where playing Trine - three player. For those who say it's too hard to start multiplayer, it's made quite clear to you, as soon as you see your controls.
Another thing to think about is value. So GameSpot are moaning about the price? Are they mad? If you can't pay for this game you don't deserve to play it. It took me a good 10 to 11 hours to complete this game with three people, and I am happily completing it again very shortly. So for example, if I complete this game twice, and I paid $5 - that's only 25c an hour on this game. You have to be mad not to buy this game.
I'll end this short review here. Please keep in mind I only paid $5 for this game on the Steam special, but I would have happily paid $20 for it, and I strongly encourage you to do the same.