2. It Didn't Take Advantage Of The Environment
The idea and concepts for the film were probably the only "good" things this movie had. The basic premise of alien monsters arriving to the planet in a meteor gives it an interesting twist to the general concept we have of an alien invasion. And much like District 9 it went straight up to the interesting part by showing how mankind was adapting to the life in a world where monsters are real. We have here an interesting new world that could've been explored, with a premise that pretty much implied that we would see how much things have changed after the event. However at no point we see how and in which ways this event changed the people's lives, or to be more specific how different life would be. Sure we see that life pretty much sucks nowadays however the whole environment feels extremely generic. There's nothing that makes this new world unique and different to any other world and the interesting part of the movie (the monsters) were in the movie less than a 5th of it. I'm not saying they should've been the main attraction of the film, however they could've been much better used through the film and not just on that interesting, but pretty dull ending. Let's compare this movie with a great movie that is also set in an extreme environment: The Road. While we don't see much of the world they live in (and to be perfectly honest the environment feels quite generic from time to time) it still takes full advantage of the place our main characters are, how they and all those who they encounter have to change their lives in order to survive to that specific problem. The overall plot of the movie uses the world they're living to make the story more interesting, while Monsters on the other hand doesn't do absolutely anything with it.