User blog comment:PFC Arkalis/Battleblog 7: Battlefield 3 introduces themed co-op campaign/@comment-1990578-20110819234757/@comment-4092510-20110820003844

I think that the Enemy A.I. will respond differently every time so you can't just predict where they'll spawn, predict all of there actions, and get rid of them. I'm really hoping that the A.I. will be much more responsive compared to Battlefield: Bad Company 2. The A.I. was ok but it wasn't that great either. I think your second theory might also be the case.