This movie was terrible. I'm a big fan of Matt Damon but this was a dud. It was the same director of District 9 so he copied a lot of same elements. Basically this movie is a bad, more Hollywood, bigger budget version of District 9. Instead of aliens it was a lower class of people.
You can tell the director was a Halo fan because he stole a lot of elements from the game from the Halo rings all the way to the personal bubble shield.
There was so much camera shaking that it was difficult to enjoy the movie sometimes. The characters were flat and one dimensional. There is not much else to say other that the movie was a waste of time and money.