Yea, there was something about the sync of the players. In my play through I had advanced a few checkpoints ahead of my friend (while he was away on a phone call), and after that we couldn't get back in sync and the game wouldn't let both of us past the last checkpoint. If they could've fixed this one problem, the game would be a very solid hack 'n' slash. I had a blast with it 90% of the time.
Playing on anything but easy too, was impossible. You just get mauled from all sides.


