I like the opening, pretty much everything inside the Predator ship until one of them starts shooting like crazy. The trophy room was cool, the Predator cleaning the Alien skull, and what you could see of the Predalien. Too bad there was no real fight in the spaceship.
I do enjoy the scenes when we're following Wolf, specially when he's investigating in the Predator ship and later starts preparing for war.
Loved seeing the Predator Homeworld.
The Alien lurking under the Predator in the Power Plant was cool.
Aliens vs the army was ok too.
The score is pretty good.
Guesa that's it.
I do watch it from time to time, but usually I have to speed over the human scenes to be able to finish it.