I have had a lot of fun with this game up until level 3 of the PvE section. The games difficultly goes through the roof and by the last stage, with the perks AI receive, you wonder how you could ever win. And when you lose, it's back to the beginning. You could spend a whole day on this game and not even make a dent in your overall progress. Lost all of my interest as a casual player, which is a shame because the actual game is fantastic.