Horrible characters, dialog, script, pacing, etc. (Sarcasm ahead) But, if you understand some basic principles this movie is brilliant. First, we know that humans become socially inept and complete idiots through prohetic stories like Idiocracy. People are just dumb and becoming dumber. It's not their fault, it's technology's fault. We can see it unfolding before our eyes everyday as the youth can barely form a cogent sentence when face-to-face with another person. However, when they have their electroinc device in front of them they transform, like alien black goo.
Second, I hate to point this out, this movie is in the Alien vs. Predator universe. Was is not obvious the engineers created humanity to serve as eventual hosts to create xenomorphs? The original plan was create people, then drop some xenomorph stuff (who really knows how xenoes are created since the life-cycle got all jacked, beginning with Alien when the cocoon scene was edited out, and the queen in the next flick) so there would be a planet inhabited by tough xenoes. Engineers and Predators must be bestest buddies. For some reason the Engineers must've owed the Predators a favor that's why they were building them a planet of foes to fight. Sadly, the egineers phocked up, like the god of the Old Testament, and had to resort to Plan B. Oh, by the way, engineers are also dumb, like us, and have experienced the devo priciple just like earthly humans, only they are much futher down the Idiocracy road than us. Why else would the engineer start throwing punches first thing after a long nap. That engineer was likely a former porn star or wrestler (or both) when he lived on Kolob some 3 thousand years ealrier. So, they effed up and the earth never became the coolest hunting planet in the galaxy. Dissappointed Predators had to hunt people instead but got their asses handed to them by an Army dood and a cop. The Preadtors eagerly awaited the Xenoes and finally got them somehow (I couldn't finish the Alien vs Predator crap).
Ridley Scott has legitimatized all the stories told after Aliens with this POS. The man needs to retire.