1. Haven't been this mystified by an acclaimed feature-film's appeal in a LONG TIME. And, no, I don't care that it's not a horror film... it's just... what is it?
2. It isn't particularly novel; the basic scenario, and thematic set has been examined to death by other speculative fiction.
It isn't particularly well written; the dialogue is strictly functional, and the narrative doesn't swell or develop so much as it conveniently swerves fifteen minutes before the end.