Frist of all people who say the only flaw of One Piece is its pacing / amount of ep are either blind or brain dead.
And people who hate one piece because its just more famous are brain dead too
Flaws of One Piece:-
1) It doesnt know how to handle trauma, Dont get me wrong they show different traumas brilliantly like slavery , child exploitation, Tyranny etc. But the answer to all those trauma are always the same. Find the tyrant/Opresser and then just beat him with a punch, if the enemy is stronger just beat him with stronger punch. Then everyone partys and everyone now is happy. Thats not how it works bro.
2) One piece is afraid to •••Show anyone, even people who are not important to the story. He always does fake out death. If you want the biggest example its Pell. I am not saying death is needed always but always faking them deprives the anime from any tension. As Sanji said "Dont cry you fool, how many times have we seen miracles". Miracles stops being miracle when it happens every •••Show time.
3) Everyone luffy saves need to be someone big, it cant be a normal citizen. Oh vivy she is a princess, oh shirahoshi she is a princess too, Oh rebecca she is a princess too. Tama she is from Kurozumi family a very important family in wano.
Honestly I could have said much more but I dont think people will read this long let alone there be more paragraphs.

I also love watching One Piece. But the fandom Saying its the best story in the world and refusing to ackowledge its flaws is what ticks me off.