Halen, TheMonkeyWench, and I tried this campaign last night. There's some promise and serious gameplay issues, like holding a button for 5 minutes to move the AC unit into place. I know what they were trying but in practice it's just not very fun to hold a button. The Air Strike effect is cool, except that it wiped us out because we have no clear idea where to go.

Instant death without warning to creep an inch outside the mall when you have to close the doors was another unpleasant surprise. Instant death because you didn't reach where you needed to in an air strike. Instant death from not knowing what the security door timer countdown objective clearly since it only plays on the radio one time which can easily be drowned out. All the ways to die without feedback makes the first play plenty painful and not in a good way.