There were indeed. None could've been worse than the melee system...
I used to say once "They can't do worse than Paul Anderson's AVP"... Greg & Colin Strause show me how wrong I was.
The melee system could have been great by this way if some featured were fixed as:
-Marine can't use Melee (not enough strong to be a real threat for both Alien & Predator).
-Alien should have an advantage on Predator with the melee.
-There shouldn't be any ability to block.
-Improve the auto aim by not giving it such a huge range (distance). Also, don't allow the player to hit another one this one is not in the FOV (sometimes my character make an instant 180° to hit a prey)
-Play with the Stealth kill to prevent hit spam as for example you could only do it if he's not moving.
In that way, it would have work much better. Maybe increase the pulse rifle damages since Aliens have no hard time to reach a prey... but do have hard time to kill it without using E-spam or wallwalk tail.
If we get the SDK, I think that's what need to be done first.