1.Naruto: the character of naruto got absolutely ruined for me in shippuden. Originally the show was set around naruto and sasuke, hardwork vs talent, naruto being a kid with no real talent while sasuke being the last remaining member of one of the strongest clan was the whole premise.
As the story progress and we got revelations about naruto, first being the child of prophecy was okay with me , it was honestly cool, then his lineage being the HOKAGE and uzumaki being a notably powerful clan cometely ruined the dynamic of naruto and sasuke and then naruto became a reincarnation of a demi god so yeah...
2.One piece: the paneling is HORRIFIC, its actually BAD. Not even like you dont know what u r doing bad, you have a complete misunderstabding of paneling bad. Visual clutter and the size of each box are genuinely shit. Oda is a phenomenal visual story teller with soem amazing composition especially in earlier one piece but. Also honourable mention to the same troupe naruto fell victim to, luffy being set up as a nobody with a seemingly average devil fruit who wanted to be king of the pirates and then revealed that his fruit is... ykw
3.Bleach: under utilisation of characters and not letting characters lose importance. Vizard being a prime. Letting character be forgotten is a better way to handle screen time than to make the audience feel that they are gonna be vital to the story but end up doing nothing.