Season 2 of BnHA is when it is good. Todoroki starts working through his trauma, I especially like that he isn't immmediatly ok with using his flames after his fight with Midoriya. Shinsou gets to comment on how the society/UA is unfair to those with less flashy quirks. Which is a plot thread that I wanted to see continued in season 3, but that didn't happen.
Instead Horikoshi keeps piling on new characters and having really basic fights (the midseason climax felt really underwhelming). People where hyping up season 4 so I read ahead in the manga (I'm caught up now). My main problems still exist, so I'm not sure if I'm even gonna watch season 4.