They're all quite well written actually. For example one thing about Linlin that gets a lot of hate is her memory loss in Wano. People don't realise or understand that her childhood showed us quite clearly that she is prone to memory losses/lapses. It was entirely within her character for something like that to happen.
Kaido's whole spiel was not about being the strongest, but about making a meaningful contribution while he dies the same way his captain did in God Valley - this is why he wanted Joyboy to kill him. Why he was jealous of Oden, Roger and Whitebeard.
Just gotta pay attention to the small details and it completely changes how a character is perceived or comes across.