I've played the demo and I am really not liking it.
Definitely built on consoles ported to pc. The marine has some kind of input lag every movement there is about a seconds delay, makes it almost impossible to shoot anything or stay on target. You cant turn off the torch, I dont suppose it makes much difference as everyone else can see you perfectly fine anyway. You walk like there is a major stutter, like they've tried to emulate someone walking but no one walks like that.
The Predator is fine, fast, no movement lag, although controls can be still a bit awkward. The alternate views are pretty much useless, only as a quick toggle and then back to the standard full colour view.
The default setup controls are just confusing in no way fluid there not where you would expect them to be.
Its a mess it appears they didnt do any playtesting at least not on the pc version.
There are some good things in there, but its really hard to see them.