I'd heard enough about this film to know that the less you knew going in, the better. I was surprised to find out that the big reveal actually happens in the second scene, about five minutes in.
I feel like it paints itself into a corner, so to speak. The first half is gripping, but then struggles to come to a satisfying conclusion beyond the fact that the father and the mother are monsters.
I'm guessing it will win the Oscar for sound design, deservedly so.
It's a film that deserves credit for taking chances, but comes to an unsatisfying conclusion.