Opinion without spoilers:

I liked knowing that the story is not the same as in the games. You have to look at it as if it were just another movie and not an adaptation, because they really made a very good NEW story.

Opinion with spoilers:

I feel like the story is very fast, and a little confusing for people who are new to FNaF. For a momen Mike is looking for a job and the next there are animatronics talking to his sister. There are also some plot holes that left me a little 'empty'. There is nothing about Henry, Charlie, and other important characters in the story. But I suppose they will mention them in school (if there is one).

But hey, it's just my opinion. I give FNaF Movie a 6/10