This movie was a giant waste of time, IMO.
SPOILERS BELOW HERE.
The world is now inhabited with "demons" that make you see the worst/scariest/saddest thing you can imagine, but the audience never even gets a split-second look. Think of all of the depth that they could have added to the characters by giving just a glimpse of what the victims saw.
The entire movie was extremely predictable, from the car ride back from the hospital at the beginning through ending up in sanctuary. Riding home from the hospital making a huge deal about driving safely? Crash incoming. A woman risks her well-being to save the protagonist? She's dead. New guy shows up in the middle of the night? Turns out he wants to kill everyone. "Crazy" raiders are driving around to the neighboring houses? Bet your ass that they're going to show up the next time they go out scavenging. The only thing that caught me halfway by surprise is the school for the blind, but the scene seemed so cheaply done and dwelled on it like it was some huge reveal.
But worst of all was its horrendous portrayal of mental illness. Everyone that's "crazy" became agents of the demons. This leads one to infer one or more of a few things:
I could go on, but I'll stop my rant here.