It's 50/50. A few bugs, level scaling enemies, generic plot, focus on melee combat. Co-op isn't too bad but it has an ingame mic that can't be muted. Special zombies arn't that creative. You're always online so unless you set it to private slots/single player, random people can join your game. To me it was ok but it got old. I pretty much powered through the last 2 acts to finish it, I was done by that point, it's a pretty long game, especially if you do a lot of the side quests.