What I don't like is the blatant waste of cultivation resources being used from his personal stash for the war. You know you require a ridiculous amount of resources, yet you still waste 1000 high spirit stones per shot, telling people that they shouldn't stop shooting and use all the stones they can. It's like a bad joke when the MC has resources to cultivate for a long time and then wastes them on a fight that doesn't affect them much once your loved ones are not in danger...
He also wastes cultivation resources on other people even when they have no way of ever paying him back. Generosity only goes so far, especially when you're weak. He also reveals all his greed inducing treasures a lot, which makes him enemies with everyone. Only a moron does that, and his yellow bead of good fortune can only do so much against poor decisions. He is unable to be respectful to stay safer like a normal person.
Even worse, when he does have a decent amount of resources, he "conveniently" does not cultivate and get stronger faster because he just wants to explore or something. Plot device to keep the MC weak happens over and over again.
Also, giving a fake name where all you did was switch your first and fast name is stupid. The fact that this is a common thing in chinese novels is really sad. It feels like all MCs are universally stupid.
I also find it stupid when a MC intentionally leaves behind tracks for this enemies just so he can taunt them. I find that to be really stupid. He takes a high number of cocky moves that backfire greatly.
Another Unfortunate thing is that some of the plot threads get resolved in terms of enmity really quickly through a few chapters. All of those people that tried to kill him over all of the continents are killed off one at a time over a group of chapters. It doesn't ruin the story, but it leaves you slightly unsatisfied, even though thats how the real world works. Unlike other stories, the MC doesn't always kill off strong antagonists. He just finds a way to escape, and both continue living their lives until the MC runs into them again when he's a lot stronger.
Another thing I found weird is that people kept trying to kill him claiming he was a devil cultivator, but as the story went on, that stopped completely. Now they just say that they want to kill him for his treasures instead of lying about it, although he never stopped using that devil axe...
Apparently there are dinosaurs in East blue somehow. And according to the author, people with bounties in the hundreds of millions just wander East blue. And then it went from belli currency to gold and silver coins...I stopped reading One piece after the time skip, but I don't know if that became a thing.
Also, MC is overly OP. He can get and use all devil fruits. No limitations. Unfortunately, he became stupid all of a sudden.
He is getting crew members in a similar order to Luffy as well with the navigator and swordsmen. It is lacking a bit of originality.
He even gave away the healing fruit so far to his one and only crew member. So apparently no one can get in the water on that ship. He says its for her protection, but she is a non-combatant, and if she falls in the water from not being able to protect herself, she'll die anyways.
What I don't like is that the MC stopped focusing on all of the Diablo Characters, and just worked on the barbarian character. On top of that, he is min maxing, because "he can just switch to other characters." But if you don't level up those other characters, they are just going to be useless weaklings... doesn't make sense...