How did this movie get a single negative review, even? Did the critics even watch it completely? This is a wildly-entertaining movie that's a much-needed break from the conventional alien movies that we're used to and not just some people mindlessly running around gunning down anything that's not human-like. Very meticulous storyline. There's also some adrenaline-rushing, high-intensity action scenes that I totally loved every moment of! Don't listen to them haters. Give it a watch. You'll have a blast.