The arc isn't "bad" I just find the way it's going to end way to predictable, and it seems a huge waste of time to just see the straw hats owning their opponents without even breaking a sweat, since it's stopping us from seeing the NW, which will undoubtedly be !,000,000,000,000 times better than this arc, yes, I want this arc to end as soon as possible.
But besides that, this arc seems to make less and less sense to me, at the beginning oda made the frog swordsmen guy (xd) out to be an incredibly strong fighter, I don't remember exactly what happened but he slashed luffy or something and luffy said "he has to be really strong," This kinda set up an epic fight between him and zoro, similar to zoro vs Mr. 1, but we've gotten bullshit tbh, I wanted to see more of a challenge as this arc has been going on for over a year.
And the same goes for luffy, he makes it seem like hody got some huge power boost, twice, and then he still gets one-move-pwned, it's not very entertaining seeing constant one-move-pwns, especially when it's against the strongest people on fishmen island(from what it seems anyway, as hody took out the princes with ease, and the king and his arm) besides jinbei.
In short, the only result from this arc is that oda basically pointed out(unless he introduces new and more powerful fishman) that fishman are extremely weak in comparison to anyone in the NW, with the exception of jinbei who seems to be on a completely different level than any fishman, so while the arc hasn't been so bad, it has been FAR from good, it hurts the story line, doesn't add up so well, and has been dragged out sooooo looonnnggg!!! I WANT THE NW ALREADY!!!