Amazingly fun. The 4player coop is awesome and I'm glad it was finnaly done in a game, it's only fitting that the game is Halo3. The lvl's can be vry vry vry hard solo on legendary so coop is the preffered route. The story is top notch. Multiplayer is the best as espected. Nothing and I mean nothing is going to touch Halo3 multiplayer not even COD4. The story has some very odd but head scratching turns, but it all makes sense in the end. If you don't like this game then it must not be your piece of cake and you really must live under a rock or are just plain stubborn/ hard headed. Anyways it is definatl;y a contender for Game of the year.