In my Predator 2 review I observed that the merger of Alien and Predator franchises was not a Paul W. S. Anderson's ( the director of AVP ) fault, since even that movie already had a lot of Alien references in it, including a Xenomorph scull. So it was almost expected by this point that the next movie in the franchise would feature Xenomorphs.
The film suffers from the same problem something like War Of The Worlds by Steven Spielberg suffers from. It is too good for its own good. You have so much dopamine from the good stuff that it overshadows any Norepinephrine from the scary stuff.