Yeah, it’s definitely one of the best horror films to come out in the last decade. Up there with The Witch. It’s a slow burn, but has some pretty crazy scenes that will catch you off guard. One of the best aspects is lack of music ques during anything that might be remotely creepy, so no loud jump scares telling you to jump out of your seat. The whole thing is in the vehicle of a family drama, but with horrific elements, which helps with the willing suspension of disbelief.
It’s also worth a second watch just to pick up on things you may not have noticed on the first viewing. I caught it in the theaters then waited a bit after it was on video to take it in again, and was enjoyable trying to piece clues together.
If you liked The Witch, or movies like The Ninth Gate, The Changeling, etc, you’ll enjoy it.