The biggest thing that ruined One Piece, is Swordsmen. the sword fights are the most boring and least creative fights in the series. and Oda had to basically give Swordsmen "Super Haki" to even try and make them good.
I feel inclined to agree. Swordsmanship in OP is the most Unga Bunga type imaginable.
I tend to dislike that Zoro is all about being the best swordsman when it feels like 99% isnt even swordsmanship but just pure muscle.
Its not how well you strike but how hard.
We had Mihawk vs Zoro and real swordsmanship was displaying how someone with a small knife can defeat someone with 3 swords solely cause skill and perception, not just force behind the strike.
People will hate me for what I will say next but the series should have more unique swords or more variety. Not just Haki or DFs behind it.
I remember seeing a video where some Katana master was trying to learn and understand a Broadsword and nerded out over the Pummel.
We need legit swordmasters. Not just SWORDS.
Give me Zoro vs a master of a Zweihänder and how Zoro needs to learn how to adapt to fighting such a beast of a sword and its reach for example.
Not just progressing from "I CANT CUT STEEL" to trying to make a exciting fight over needing to cut Pica.
Look at the creativity behind some DF fights. Swordsmanship in comparison is just "ME CUT YOU STRONG. YOU DIE. UGA BUGA".