Ive had a play around with the demo and it's quite fun. I am not a big fan of deathmatches though which is a bit of a downer for me, obviously other game modes are going to be available at release.
I do hope they aren't planning to stick with the matchmaking setup for the released game (I haven't looked into it so don't know if it has already been announced).
Also not too keen on the 'wall transition' mechanics when playing as an Alien (although haven't played it much). I sometimes find it awkward to transition to a wall when required as it seems you have to be facing in exactly the right direction at the correct point to get the option up to do it! I found the mechanic for the original AvP game much better when you just hold a key down to go up walls etc. then release it to drop back down.
Having said that, it's only a demo so I am expecting some things to be different / change on final release, they usually do, so I am certainly not writing it off
