It is testament to the game that Hooked Gamers can't rant about it for to long without feeling a little guilty. With friends, it is almost a must have if you can foot the bill, and there is plenty of content here for your 1200 Microsoft Points. The unlockables are bountiful, and clever usage of achievements will keep you playing after you have finished it once.
With over fifty characters and pets, and even more unlockable weapons, some of which are carefully hidden or placed in the game world, you are getting more value for money here than you get with some retail games. But still, if you don't have people to play with you should be wary.