After all the hype I watched this on Netflix with my wife. I like cross genre stories but only when the story arc is strong and themes are harmonized. The biggest failure here was the lack of cause and effect. When the humans turned into zombies and said the unseen savage entities were beautiful--that was incoherent. We saw nothing or beautiful in the unseen evil.This aspect reminded me of the Blair witch project with clueless characters running in the dark woods with web cams. The drama of Sandra Bullock's character fighting to save two kids was the best part of the film. Her personal transformation in the fight of good vs evil was muted by the action. There was a lot of convenient coincidence in the story, like the OB GYN doctor appearing in the final scene in the big bird sanctuary.