Excellent strategic game that hooks you, but is not diverse enough to keep you coming back.
The Beginner difficulty is ridiculously easy, but once you raise the stakes, the game slows way down as you think more about your moves. An individual game can take anywhere from 5 to 15 minutes, and as such, makes for a perfect online multi-player pick-me-up.
I agree with the GameSpot 'bad' point about the music... it drives you nuts after a while. Better listen to your own 360 soundtrack.
All in all, Carcassonne is a great little game, and worth the 5 bucks. It only receives a 7.5 in my books though because of how limited it is.