There are subjectives, and then there are these. While you may believe a work fits here, and you might be right, people tend to have rather vocal, differing opinions about this subject. Please keep these off of the work's page.
Golden Freddy's jumpscare is just his disembodied head flying at your face, making it harder to take him seriously if he gets you, despite him being much harder to counter than in the first game. Many Batman jokes have cropped up in relation to it.
While she's supposed to be scary, some people think the vertical burn marks on Phantom Chica make her look like a watermelon.
Springtrap is scary most of the time... except for when he's peering into the room. It looks more like he's perving on you than about to attack you. Also, his jumpscares make him look like he's merely checking you out rather than attacking you. Of course, he's the spirit of the child murderer, and those acts do go along his lines of killing someone.
Phantom Freddy creeping around outside of your window. He looks like a cartoon villain sneaking around. Just don't watch him directly for too long.
The nightmare animatronics being more overtly monstrous in design compared to those from the previous games has evoked this opinion for some of the fanbase, feeling the new animatronics to be too over-the-top to be legitimately scary. Then again, maybe this is on purpose — you are playing as a child, and many kids have rather bloated imaginations that can make some things we don't find scary terrifying for them. Also justified, as it's all but stated that the Nightmare animatronics are exactly that: manifestations of the child's deepest fears. Thus it makes sense for them to look as horrific as they do.
One aspect of Chica that many fans often pointed out in prior games is that she very noticeably has two sets of teeth. What does this game do? Why, up the ante by giving Nightmare Chica three sets of teeth!
Some people think Plushtrap is just too cute and/or small to be scary or threatening, more likely to tickle you than maim you. Doesn't help that 'plush' is commonly accepted as the cuddliest term for a stuffed animal.
Nightmarionette, introduced in the non-canon Halloween update, is rather creepy, but it's a bit spoiled by the Extra menu presumably chopping its name down to the bizarre "Nightmarionne".
Some have interpreted its eyes as it being totally high, due to their bloodshot, unfocused nature that's visible when any shots with Nightmarionne are brightened.
Jack-O-Chica's jack-o-lantern manages to be even less scary than the Nightmare Cupcake.
Nightmare Mangle◊ looks horrifying. Its endoskeleton, though, has plenty of sharp teeth too... but retains the googly eyeballs.
Nightmare BB probably could have been a lot scarier if Scott made him damaged like the others, but while he's certainly unnerving, he's just as pristine as the real Toy animatronics without a single flaw on his bright plastic exterior.
Also, his half-lidded eyes, and pitched-down "Hello?" and "Hi" make him seem more like a bored teenager than a creepy animatronic.
While the "fun, fun, fun, fun, fun" content warning screen is frightening to some people, this scare is turned into utter hilarity if you are acquainted with the "You On Kazoo" video.
Some may see Scraptrap's image in the Golden Ending as this, considering that the image makes his head look positively gigantic compared to the rest of his body.
Vanessa's jumpscare. While every other jumpscare at least has shaking movement and a frightening visage to look at, being caught by Vanessa simply has her... angrily stare at you. Not helping is the fact that the default high-pitched scream and camera shaking are still used for this particular animation; many have joked that it's due to Gregory being blinded by Vanessa shining her flashlight onto his face, which is somewhat supported by the fact that Vanessa's mouth remains closed during the jumpscare, so it can't be her who's screaming.
Similarly, the S.T.A.F.F. Bots all have a nonlethal jumpscare when they catch you, meant to hold you in place so the Animatronics have enough time to close the distance when they hear the alarm. Excluding the more unsettling variants found in areas like the Sewers, their blank, emotionless faces can make the experience feel more silly than threatening.
The endings can be hard to take seriously, thanks to the complete shift to a silent 2D comic book-style format, the characters' occasional Uncanny Valley expressions, and the overall cheesiness of it all. The True Ending, despite being in the game's 3D format, also gets this for the many questions and lack of answers it gives, not to mention the fact that Afton is unceremoniously pulled back into the burning Pizzaplex in a rather comical manner.
When William!Springtrap finally meets with Charlie and the gang, he proclaims that he is neither William nor Dave, but "My name is Springtrap!". However, instead of coming off as a Badass Boast, it makes it look like he's trying too hard to come off as edgy.
