I almost didn't watch this as the reviews were poor with complaints about a slow second half, puzzling elements and an abrupt and inconclusive ending. My take was very different! The first half just seemed filled with lots of ominous music and a family that inexplicably over-reacted to everything. But the tension and character layers built over time. Reviewers talk about the unusual animal behavior that kept happening -- although bizarre at times, it seemed to me to indicate that the animal world instinctively knew that the humans were no longer in control and they had nothing to fear. What was really happening in the country, who was behind it and how it was revealed was interesting and different. The ending tied up nicely - first, one of the male characters asks the other whether the families can fully trust each other going forward in order to survive - and trust, or lack of it, was a thread that ran through the story. Then, the final scene, in which the little girl is watching Friends with a theme song of "I'll be there for you" is a perfect wrap up - a survival bunker is discovered and they all have a chance if trust is there. It's not a perfect movie by any means - too many lapses of logic, gratuitous elements and characters who were only superficially developed -- but it was an "impending apocalypse" film with a different approach that I thought worked.
Review of Leave the World Behind
