It's a good arc to read, and I liked the romance between Komugi and the change it gradually brought to Mereum. I didn't really mind the deus ex machina "rose nuke" either, although it's often spat upon; I wouldn't enjoy Hunter X Hunter as much if it was predictable.
One of my issues is with Killua's removal of Illumi's needle. Digging into his head may be taken by some of you as a natural gesture of the strain on his mind. Yet the aura that could muffle Killua's (extraordinary) bravery has gone unnoticed this entire time during his nen practices AND during other times of combat when the opponent's strength is unknown/greater compared to his own. So, I can't even use the excuse that the Manipulation technique was an automatic one in perpetual Zetsu, which only occurs during times of tremendous danger. I could have tolerated it better if he found it shortly after learning nen, and ESPECIALLY before he subjected himself to electricity. It's mediocre, and past coverage of Killua's psychological problem made it out that more was expected. My deduction is that this is partially what justified Killua having increased action during the election arc, and no, that doesn't mean that it is a sign of good planning/writing.
There's also the combat narrative that occurred at the climax as the Hunters faced the Ant Guards. Some of the descriptions which took up a single page were more like introductions rather than revelations (For example, the basis of the Ant Guards were introduced the same time their abilities are), reminding readers that the guards are utterly devoted to the King while performing a protective action AT THE SAME TIME is redundant, inconsistent with the other ways devotion is expressed in the rest of the arc AND the series, and submits the pacing to a pattern that resembles that of a sine curve. After the strategy to separate the guards from the King was over, it was my relief to be free of that narrative style. Since I wanted to like it, I interpreted that Togashi wanted to simulate the fabled slow-motion that occurs during life and death as well as describe the intricate strategy in detail, he tried to go for more than that, but the end result is like a game that repeatedly pauses and resumes.
As for art style, the scribbles are not worth elaborating on - I've never encountered anyone denying it and saying it was good (not even a troll would try). But the designs of the grunt ants in some of the duels that took place made them difficult to take as seriously as the other opponents in the series. For me, who was sick of Greed Island monsters and longed for the more predatory villains, the prevalence of the low-ranking, stupid-looking, stupid-acting ants for long chapters between hiatus was a huge disappointment. I'm aware that goofy dangers were also obstacles during the first Hunter examination, and could be considered a part of the Hunter X Hunter world, but there's no smooth conjunction for me between laughable designs and the process of species extermination.