You didn't really mention the balance, or imbalance of the game. Allow me to explain. The little disks that the predator can get is very cheap. One hit kill, requires no energy and is the thing most predators use in matches. If you have played one online match, you know what I mean.
Also, the stealth kills. Just get behind someone and press one button? Works for me! Uggg... plus, doing that will almost guarantee your own death as unless you are alone in a corridor, far far away from anyone else, you will get killed instantly. Also, the flashlight is complete crap. To quote one of my friends "It's like they took it and smeared peanut butter all over it". Plus, no flares in MP? Those would have been really helpful...
Also, the game felt short. Way too short. Especially the aliens for some reason.
Despite these things, I still enjoy the game. I don't love it, but it's alright.