So many could fit that title, but here's a few:
* Shingeki no Kyojin - Just edgy sensationalism and post-2000 Shyamalan tier
mystery-bait. Blue Gender did a similar premise far better
* My Hero Academia - Riding on the coattails of better Shonen, particularly Kinnikuman and Part 1 Naruto, to make a Shonen that does absolutely nothing different from the rest.
* Kimi no Nawa - Absolutely nonsensical with how the main characters easily adapt to being in different bodies or never try to contact the other, but who cares about plot when feels can override critical thinking? Add the rest of Makoto's
films to the list as well.
* One Punch Man - Repeating the same joke over and over again before taking what was meant to be a satire seriously with the Boros fight doesn't make something a deconstruction.
*Fate series - Beyond Ufotable's animation and the character writing of Rider in Fate/Zero, there's asbolutely nothing good about it. Fate/Zero is predictable, nonsensical and pretentious. Fate/stay-night is a generic Shonen (and the original game is just a poor excuse for Hentai, and the rest of the franchise are just alternate reality cashgrabs.
* One Piece - Not as bad as those previously listed, or even primarily bad, but the fanbase treating it as the gold standard for Shonen or anime/manga in general are definitely overrating it heavily.
* Gintama (Relying on referential humour as its strength when taking 300+ to build up a plot that's a Kenshin knockoff with sci-fi elements that quickly gets back to meandering doesn't make one of the greatest anime, no matter what MAL says.
* Most Ghibli films (Particularly the post-2000 ones) - Nausicaa is ok, whilst Grave of the Fireflies and Princess Mononoke are good. The rest are pretty average at best family films (some such as Spirited Away heavily meandering), so placing them on such a godlike pedestal is definitely overrating them.
* Cowboy Bebop - It's decent rule-of-cool, but not much other than that with its pretty simplistic characters and limited plot continuity. Hardly one of the best anime of all time as many praise it as.
[Insert most popular seasonal
here] - They're all poorly written trash after about 2011 or so, either being more of the same mediocrities praised as masterpieces or heavily flawed works by relying on such poor writing red flags as time travel, amnesia, harem elements, etc.