Are you playing this on PC or 360? I really don't like paying MS to subscribe to their 360 online service so I might have incentive to purchase the PC version and play there (if it is free). I think this game would be super playing with keyboard and mouse although I find for most situations that control with the 360 controller to be acceptable for coop. I've been doing 2 player coop. The critiques about playing with AI team members is that you can't give them orders when it comes to setting up ambushes and sometimes they do their own thing when they should be getting up in a hard to reach, limited access, high place. At the end of the last campaign at the farm house, foolishly I tried to save one of them, got swarmed, and my partner finally said screw it and hit the button to close the door of the APC...
So how long before they add more solo content? The first time through, 4 scenarios seems long enough but the second time it feels much shorter.
Maybe because it was all new then, but "No Mercy" on the top of Mercy Hospital was the best of the scenarios imo.
* Avoid Witches if possible- check.
* For Tanks- Run like hell and evade while shooting every chance you get- check.