It’s a game about jump scares. I hate jump scares. I don’t go to haunted houses for just that reason. It’s also why I hate most horror movies and games. Horror based on suspense, tension and a real sense of dread is much, much better. So in that regard, FNAF has all of these elements but since the big jump scare is core to the game, it loses me.
Also, I didn’t expect the game to just be sitting in a room closing doors. I thought it would be more like Alien: Isolation so I was disappointed by the gameplay.