Ok boys and girls, this is only a demo right now on both XBL and PSN, I've played it on XBL and can say its a very good game, very dark but a good game. Here's how I rate by each playable species:

Preadator: Quite limited, can turn invisable but power attacks can take an age and leave you very vulnerable afterwards. They have a cool laser shot too but you have to find it unfortunately.

Alien: Crawls on all fours, can scale walls/objects which can be slightly disorientating at first but you learn to get round it. They are lightening fast, even when they are not sprinting but are vulnerable to gunfire and only have melee attacks, though that said, they do have the coolest assassination move ever.


Humans/Marines: Very slow, have no power attacks but can use pretty much any weapon, forced to use flashlight to see most of the time due to dark areas.

Hey Ib, just bought it it a really fun game a mixture of a FPS and a thriller. The graphics a half decent a few bits here and there but you soon get over it. Out of the 3 species Predator is my favorite but it is a bit underpowered compared to the movies, a predatore wouldn't stand and just slash at an alien or marine for that matter. the huge blade are for stealthy one shot kills. but other than that the predator species is pretty good. The alien can be a but disorientating like you said Ib but you do get used to it transitions are a bit clunky somtimes but it dosn't get in the way of gameplay. The marine basically your average FP soldier not really much to say.
Overall the game is a good one, great fun to play.
i would give it a 7.5/10 (Good)

ps. The trophys arn't like the regular movie game ones (for example Terminator Salvation) some are quite challenging and will increase the replayability of the game.