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It's kinda just a Vocal Minority thing. Those works aren't hated. Far from it. They're insanely popular. It's just that the silent majority of fans aren't the ones we know about.
Working on: Author Appeal | Sandbox | Troper WallPeriphery Hatedom can be a possible reason too (a large group, that is not the target demographic, viciously rejects the work, while it just works fine for those, it is aimed at).
LOAD"WITTYFORUMSIGNATURE",8,1 FILE NOT FOUND ERROROpinion Myopia overlaps with Vocal Minority for the "and everyone seems to agree" part.
It's not just that the complaining voices tend to be the loudest- people have trouble imagining that most people don't share their opinions, especially when those minority opinions are reinforced by an echo chamber or major influencer. Thus you get people shocked by the fact that longstanding franchises are enjoyed by a massive fandom.
Where this gets especially warped is when a Caustic Critic runs into Poe's Law and fans that don't understand the kayfabe of turning "This character's arc felt a little flat to me." into "OMG THIS IS SUCH STUPIDLY BAD WRITING YOU GUYS" for entertainment.
thanks all — all these tropes fit, especially Critic-Proof
i may be dead inside but at least i have Mystery :,)

(basically, this trope is "despite being rightfully derided as a Franchise Zombie or shitty franchise, it still sells and has tonnes of fans")
This franchise sucks and everyone seems to agree.
It's corny, it's bigoted, it hasn't aged well, it's propaganda, it dumbs everything down for the Lowest Common Denominator, many other franchises do what it does so much better, the fans love hating it as much as the haters do, it has nonsensical writing, people who claim they are fans get made fun of, it is infamous for screwing its creatives over for profit, they are the subject of numerous Take Thats...
...and yet, it is a Cash-Cow Franchise that sells billions and and has hordes of rabid fans that somehow stay out of the public spotlight.
this can also extend to hobbies and genres — people will mock and shun pop music, but it sells, and Moral Guardians dismiss video games as juvenile power fantasies, but it is the biggest selling medium as of later years
IRL examples include Call Of Duty, Fast And Furious, Genshin Impact, the Marvel Cinematic Universe in later years, etc
related tropes: It's Popular, Now It Sucks!, Fan Hater, Fan Dumb, Hate Dumb, And You Thought It Would Fail, Springtime for Hitler, Love to Hate, Straw Critic, Take That!, Animation Age Ghetto, Sci-Fi Ghetto
Edited by MsOranjeDiscoDancer