Got it from gamefly. I read that the marine campaign is the most boring so I figured I'd run through that one first to save the better ones for later.... Yeah, it sucks. Probably just gonna skip th rest of it and start on the Alien and Predator ones. Only played a few multiplayer modes, I like Infestation best so far. It gets pretty intense when you're the only marine left and everyone's an alien rushing at you.
Overall - rental, and I'm a big Alien fan.