as a long time fan of the games I think its safe to say that based off of the humorous nature of the characters and lax in the plot, id say as a fnaf game it lacks some serious intensity. However, I do think that as just a general game, it is amazing. however as a part of the five nights at freddys franchise, it falls back a bit.
i also feel like the comic style endings were really rushed and were pretty rough. for example, vanny dieing, vanny not dieing, freddy dieing, freddy not dieing, and everyone goes home happy, or everyone goes home sad. I'm aware that those as examples are extremely simplified, but I hope it gets the point across fairly well.
as my final note, I want to touch on how the characters have personalities and talk to each other as if they were normal people. again, it just falls short on one of the best aspects of these games (being the emotionally depraved robots that try to kill you all stealthy like and with a heavily involved fear factor). that's all I have to say, and this is really just my opinion, and again its a great game, but a lack luster five nights at freddy's game.