I can't review this and do it justice. A few highlights 
 1) There were scary parts, but I have been scared more by other ghost/horror novels 
 2) This is written crazy good, the footnotes and appendixes, weird formatting...It was all so clever. I will read this again and I know I will find new things. 
 3) The scenes depicting the dark rooms the hallways leads to are the best. The Navidson Record "transcript" I could read over and over again. 
 4) Just like a lot "non fiction" novels talking/review/analyzing about a movie, book or subject matter there were giant sections I was bored to tears in. 
 5) Can you say unreliable narrator?