I personally loved this movie, due to the elaborate story line, mixed with the sheer creepiness of the animitronics, and the tie into the franchise. The cinematography is very unique, and completely sets the mood to lend to a good scare.
My daughter is a huge fan of FNAF and did say her only disappointment was the movie was vaguely (sometimes, if that) based on the storyline. She still enjoyed it as a fan overall, and was already curious about a sequel. She's seeing it again tonight (the very next night), if that tells you anything LOL!