Also, the author decided to ditch the original side characters of Season 1, like Anak and instead brought in a lot of others. That itself would not constitute a bad thing, but unfortunately, we don't come to care for these secondary characters. I couldn't care two hoots about these characters if I wanted to. Not only do they not appear long enough for us to care about them, they are also badly written. There's so many of these insignificant characters in Seasons 2 and 3 that I've lost count. The vast majority of them don't even have any influence on the plot.
Adding to this is the complete lack of character development for most characters, making things worse. The characters also don't have consistent motivations and many characters also change their personalities out of nowhere. One minute they are ruthlessly killing their own teammates and smiling while doing so and in the next, they are crying "how could you?" at the villain for killing their mother. The only well written character in the entire series is Rachel and I haven't seen her even once in Season 3.
The next problem is the story which initially had an interesting and promising premise, but quickly went the uninteresting shounen way. Shounens themselves are not bad, HxH is a very good example of a shounen. This story is extremely bad due to the way it is excecuted. Two things were incorporated which made things worse - the power of friendship from Naruto and Dragon Ball Z style attacks. The fights only have flashy shinsoo light explosions now. There's no intelligence to the fights.
Another huge problem is the excessive focus on Baam, who is the typical angelic and flawless shounen MC. In ToG, whenever you get an interesting premise for an arc, 90% of the arc will be about power levels and how special Bam is, with the villain then getting two pages worth of back story after he's defeated and the arc ends. That's a problem with with plot and characterisation at once.
The plot has been going nowhere since Season 2 and I'm not even sure there's a plot to the story anymore, there no longer seems to be an end goal. The first Season was rather nice, had quite a lot of potential. But man the 2nd season was a bore. The story after the workshop arc was such a pain. I had to force myself to read through it. I've hadn't read something so boring and generic for such a long time. ToG is essentially a series which had potential, but squandered it terribly. I don't think the series is worth investing time into. There are way better series out there that you can read instead.
Overall, completely overrated and not worth investing time in.
