My problem with AvP to me was everything was thrown in. So, so many characters introduced. So many concepts. Archeology, genesis of human society, shape shifting pyramids, eggs, facehuggers and a ramped up life cycle, Predators attacking humans, Predators vs Aliens, Predators capturing a Queen, Predators distributing eggs, the human Predator team up, introducing the Pred Alien. To me it doesn't serve the franchise to cram all of this into one movie, so I felt they needed restraint, words of wisdom spoken in the form of "pace yourself" when developing the first film of a series. Take a concept or two, flesh it out and let it breathe!
As a byproduct of this approach, it could have resulted in more AvP battles in the first film.