Infestation was legendary in AvP2. I don't remember how many hours I spent in that damn basement in Quarantine, flinging millions of bullets, rockets, and grenades into that ramp of doom
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@ Moss, I know they didn't show off any at the demo, but I'm hoping that since Gearbox has made so many stellar co-op games (BIA, Borderlands) and since they've already talked about it, they will start adding a lot of the squad/teamplay elements. I don't expect Rainbow Six-style complexity, but the basics would serve players really well.
The fact is there's going to be lots of inter-squad tactics and communication with 4 player co-op anyway, so some tools and abilities to boost this would be welcome. I really don't want a run-and-gun game because even if the campaign is awesome, what's left to keep it interesting afterwards?