Hey, I'm sorry this took so long. The school in my country just opened recently, so I was panic and ignore your reply. I hope you can understand.
My problems with HxH
Arcs didn't connect well. They felt very disjointed from one another. The only real connection that's consistent with each arc is that they trigger each other. For example, Yorknew City triggers Greed Island which triggers Chimera Ant which triggers 13th Chairman Election. I'll quote from a review I'd read in MAL:
Instead of focusing on an overall story, the arcs feel like a bunch of mini-stories building up to a main one, and they focus way too much on the individual arcs instead of an overall story, making it seem like a huge mess. - DarkDawn, MAL, 2014.
I totally agree with this one. The arcs really felt like a bunch of mini stories. Even the Chimera Ant arc. I see that it's trying to mimic JoJo or harry potter's structure, but the difference between HxH and these 2 is that those 2 are supposed to be a mini stories, building up to the climax, while HxH is supposed to be one story.
Consequences didn't last long. This one is a bit controversial. I know about the conditions and restrictions stuff is the embodiment of every decisions matters, but if you notice, the consequences of action are will be neutralise after some times. Sacrifice your arms to make a clean hit? This is isekai, of course there's heal-all potion (or card). Oh no, our friend became the foot soldier Chimera Ant and there's emotionally and neurologically no way for she to come back! But, with the power of friendship, nothing is impossible! Make a Nen contract that sacrifice your ability to use Nen ever again? No worries, your bestie (and his imouto) got your back. The consequences is there, but quickly neutralise soon after.
Too many training arcs. This is perhaps my main reason I devalue HxH so much. The Nen system is very good, I won't dispute. I daresay it's the closest power system with perfection. The problem is that Togashi made us spent too much time with Nen through training arc and info dump. It sacrificed the potential for actual plot progression with the expansion of power system, which made it obnoxious and wasteful. Togashi should've manage the expansion better and have a better balance between plot progression and power system expansion. I do realize that it's made sense why they would want to train, but Togashi is an experienced author. And as an experienced author, he should've been able to manage the stuff that I just said better. I haven't watched YYH or Level E yet, but YYH seems to have a good reception, so if that's really true, there's no good excuse (in my perception) for this. (And I will so disappointed if the Succession War arc turned up to be another training arc.)
Togashi has abused the narrative too much. Far exceeds the acceptable degree. I do think hxh is the kind of story that can work with narrative, however if it's to the point that I cannot make my own interpretation, that's too much. This is especially true during Chimera Ant arc, specifically during the castle raid. I was told that Pitou can't fly since she's a cat, what? What the heck is Togashi thinking during the time? I am not stupid enough to not know that she cannot fly. I am held by my hand to be let to discover nothing on my own. The narrator is also tends to convolute stuff. For example, that time when Gon reduce Pitou's time to heal Komugi for 10 minutes. I mean, 10 minutes are 10 minutes. 10 minutes is a common number to if you wanted to punish someone. Unless Gon reduced it to 50 minutes, then it gonna make sense. Togashi should be more selective with his narrative.
Please note that these are all my experiences and opinions.
To be honest, I have much else say, but I seems to be not be able to word it properly.