Once it fully embraces its own darkly comic monster movie impulses, it’s a lot of delicious, enjoyable fun.

Beautifully nuanced performance by Shailene Woodley; well-staged direction; just the right tone and atmosphere.

Extraordinary, ignorant, belittling, audacious, stupid, perceptive, maddening: a 20-mph rollercoaster, rowing against the wind.

Can't see the forest for all the jump scares.