so far i'm really enjoying the demo and i want more. i can see how the controls are being called clunky especially while dealing with the marine but i honestly feel its more of a balance mechanic in that case. It is a class built on range and firepower, but due to its slow movement and aim it conveys a good sense of terror when your motion sensor is beeping like mad and you cant find wherever whatever is. i've certainly had more than a few holy crap moments as i was slaughtered unmercifully by something out of a shadow, and to me is what this game needs to be all about--it is the best horror game experience i've had in a multi-player environment by far.
The alien after a few hours of me getting used to is insanely deadly and its very easy to make hit and run attacks, or drop down grabs. It seems to me this is the quickest most agile class, its sprint is crazy fast. Though as mentioned above the transfer and jump commands could be tweaked for the better.
the predator i'm still figuring out, but having come up to a couple of good ones i can see how they will become a huge pain in the rear.
Though the game isn't perfect i do feel it is reasonably balanced at this point (read that as nicely playable but improvement is possible) i find promise of it being another fun class based multiplayer shooter that will stand next to tf2 in my steam list (please be dedicated servers *holds breath* and some fun game modes), this isn't your average UT/quake game here and if that's what your wanting--look elsewhere this game just isn't going to be as fast paced.