I'm still unsure about this. I'm not keen on the idea of gimmicky Aliens; exploding head or ramming aliens in particular. One of the biggest issues with game versions of the Aliens is that they're never half as deadly as they should be. A team of marines shouldn't stand a chance against an equal number of aliens. I know it's a difficult balancing act between extremely deadly foe and making the game enjoyable – so I fear this will be the biggest shortcoming with Colonial Marines.
I haven't heard much about co-op campaign recently. Is this still going to happen? I really hope so. I see this mode as potentially being the best part of the game.
I'd love this to have been worth the wait, and turn out absolutely stunning. I'll keep an open mind, and will likely purchase this, but I want it to be more than just a decent single player game. Still, if all else fails, I'm sure this won't be the last Alien/s-based game. It's a cash-cow that will continually be milked and one day, a developer will produce the ultimate Alien game (fingers crossed this is it).