I liked the movie overall but it in my opinion, it was more like a Sequel to movie that I didn't see the 1st part. It has holes.... like for example why would there be an Alien craft hovering over a city for 20 years and no one has mentioned the fact that it can HOVER above ground and defy gravity, yet we still have helicopters flying all around it???? You'd think in 20 years we'd have figured out how the craft and do that.
The movie centered too much around the displacement and bad treatment of the Aliens as if they were 2nd, 3rd class citizens and in some cases like pure Animals. How do you expect them to act given the living conditions they had to endure.??? My biggest gripe though centers around the fact that the ship can Hover and defy gravity yet it wasn't mentioned once in the movie on how it does that, and we are still using primitive technology flying around it.