What is probably most striking is that the multiple POV narration includes extensive 2nd person present ("You do this; you remember that," etc.), which I found distracting rather than engaging. It also seems to me that there are two main story lines, and while you'd expect cross-over points, they really feel independent of each other. The book starts with a fantastic description of the house and a small door nailed shut with 39 iron bolts, but this ultimately felt under-utilized.
I did get more into the book as I kept reading. At its best, I felt the book worked as a metaphor for a family dealing with trauma.