GamingShogun.com writes, "The AI of your teammates is also wonky, with them sometimes falling behind for no reason, only to “rubber band” to your location. Other times, they will move forward without you, leaving players to catch up. With that said, the game’s story campaign is a whole lot of fun in co-operative mode. There, you and your friends can geek out together as a squad of “ultimate badasses” and take on the alien hordes. It still does not solve the issue of AI, but it does circumvent it a great deal."
I think there is somewhat of a difference between platforms on this one. I have had friends say that their PS3 version is awful - worse than DNF. I have the PC version and, while it has problems, I am digging it as a fan of the movie.
Don't get me wrong - it has lots of problems, but DNF was far worse!