The entire games easy on whatever difficulty you choose. But that doesn't take away from the fact that its amazingly fun to just sit down with that game and play coop with someone. It's a completely different style of game than Halo, and therefore can't be compared to it. But the coop in GOW is unbeatable IMO, because it's easy to sit down with a friend, choose your favorite chapter, and then watch and play the fantastical game
PS - Fantastical is a word, i didn't know that until a few days ago...