Since I'm doing the Naruto reread.....Naruto.
The problem was that it was a very slow destruction, so you can't pinpoint the exact moment it became irrecoverable. In fact, I'd say it started as early with the different direction that the story took after the Mist arc. The Mist established the Naruto world as a special kind of brutal, and after that it became more traditional shonen. And you thought it just put the darkness present in the Mist arc aside for later, you thought it was showing variety, and the content was still good, so no big deal. But reading it now, knowing how it all turns out, the Mist arc is still really good, but it set up some promises that Kishimoto didn't deliver on. But like I said, the stuff afterwards was still good, and then it slowly....slowly started to fall apart. Until you realize how many character assassinations have taken place, how stupid the plot has turned, how many retcons have begun to take place.
Naruto is the worst manga I know of for that reason. It's not objectively the least proficiently written, but....it's the worst.
The problem was that it was a very slow destruction, so you can't pinpoint the exact moment it became irrecoverable. In fact, I'd say it started as early with the different direction that the story took after the Mist arc. The Mist established the Naruto world as a special kind of brutal, and after that it became more traditional shonen. And you thought it just put the darkness present in the Mist arc aside for later, you thought it was showing variety, and the content was still good, so no big deal. But reading it now, knowing how it all turns out, the Mist arc is still really good, but it set up some promises that Kishimoto didn't deliver on. But like I said, the stuff afterwards was still good, and then it slowly....slowly started to fall apart. Until you realize how many character assassinations have taken place, how stupid the plot has turned, how many retcons have begun to take place.
Naruto is the worst manga I know of for that reason. It's not objectively the least proficiently written, but....it's the worst.