I liked most of 'Leave the World Behind'. I didn't find the characters as annoying as others did. They were realistic -- annoying at times, likeable at others -- just like real people.
I was kinda disappointed with the apocalyptic ending. Would have preferred that everything was a temporary glitch instead of an actual attack -- especially for a movie release at Christmas. The movie really fell apart at the ending with the little girl just happening to find a place with a bunker (where was the family that built it?). I appreciated the Friends tie-in, but the ending was very, very sloppy.