I'm giving this a 3 only because the subject and interviews were very interesting. The Booth brothers have absolutely no idea how to put together a documentary though. They jump all over the place, include things that are loosely related at best, like the AmittyVille case. Also they need to remember that people who watch documentaries normally know what they are looking at. You can't show a crime scene from the Defeo family murders and try to pass it off as a crime scene photo from another case.
I really wish they would have spent more time on what the diary said and less on their "did you hear that" ghost hunting crap. Not to mention this is about the Haunted Boy, yet they spend a good chunk of the "documentary" on clips of their investigations into other cases.
All in all, the subject is very interesting and I'm looking forward to seeing a decently done documentary on it.