Humanity here seems a bit overrated...
For a movie about what is a human being when deprived of everything, it was quite disappointing and irritating. All the characters in the movie except Eva, Adrien and Devlin were so unlikable from the very beginning, that to imagine such a group being together in any other occasion is laughable. But yes, that was the point, to see how would so random individuals behave with each other under extreme circumstances. But no, they weren't a group to begin with - no real discussion, no real cooperation, no real care for the others, no real effort to solve any issue they had -- just a bunch of whining and/or spoiled selfish brats you wouldn't socialize with in the normal life. I'll put aside unsolved mysteries happening outside the shelter, because the focus of the film was anyway on the people inside who didn't know what was going on above them. So, had that focus been more realistic, more rational - I refuse to believe that people would really behave so dumb as mindless creatures way below the animals - I would even recommend my friends to see it, because the actors did really nice job, and the movie does raise few interesting questions about humans. But it didn't delve beyond that. We might ask just the same question that Eva posed to Josh, had they enjoyed too much in presenting the dark side of human beings, that much that the perverseness of it didn't make any sense at all.