I have watched markiplier play the games. I have seen those deep dives on the lore and I was pretty excited to watch the movie. If you don't know the lore, or have played/watched the game, it will be pretty boring. I have just came back from watching the movie.
SPOILERS AHEAD
The graphics were amazing. The story was pretty good and I was entertained the whole time. I had goosebumps from the music and the creepy scenes.
The movie is not the first game at all. Not like people thought. The restaurant was pretty cool. Michael having a sister and seeing the 'missing children' and the plot twist of Vanessa being William Aften's daughter was really sudden. The exact scene of the animated scene in either fnaf 3 of 4 where William gets trapped in the spring trap suit in front of the robots was really cool to watch.
The robots (can't spell the proper word correctly) being friendly with Abby was a really cool twist.
The jumpscares was scary and unlike the games, the jumpscares weren't appearing too often so it wasn't unscary after a while and the post credits scene was cool.
The animatronic costumes were really well made and it kept my attention during the entire movie. Even though Mark wasn't in the movie, it was cool to see the game theorists guy make an appearance (even though I don't like him) and Cory (I don't like his videos).
Overall, a solid 5 out of 5 and I can see this movie having a sequal. It is definitely worth a watch if you haven't already.