My actual rating is 3.5.
As a fan of the games I really wanted to read this to see if it added anything to the story, and all I can say is yes it did!
The characters were well written, although I did find the main character sometimes very annoying. The horror was so well written that I had to stop reading at certain parts because I was really creeped out! (It was great! Lol)
I will be recommending this book to my friends who love the games as I think it gives them some extra information into the Five nights at Freddy's story.
I enjoyed reading this and I will add it has made my paranoia about robots so much worse! ;)