Well, after 4 games of various results. I'm rather digging this.
Sure it was just straight up Deathmatch (of which I have no desire to play in the full version), but I got a handle of the mechanics for all 3 species.
Teamed up with a fellow marine as we got stalked by a alien (I hope the motion tracker shows your team, for extra paranoia)
The Predator is alright, and the alien is sublime.