Fishman Island - 3
Probably my one of my least favorite arcs in One Piece history. Down there with the Davy-back fight, but at least that was mercifully short. The basckstory was great, but Hody felt like a discount Arlong. Sanji was flanderized beyond belief, and the princess character was super annoying. I actually took a hiatus from One Piece after this arc.
Punk Hazard - 7
Okay arc, not great but not that bad. I wish we got to spend more time in the burning land. The alliance was great, the comedy was great, and the fights were good. Poor Smoker got treated like a joke though.
Dressrosa - 7.5
Dressrosa is weird. It has all the mechanisms of a great arc, but there are just some things that bog it down. I feel that the colosseum portion and the battle for Ace's fire fruit could have been a separate arc on it's own.
Zou - 8.5
Nice arc with some good lore. Minks introduction was great, and it was good segue into the Wano arc.
Cake Island - 6.5
First half of Cake Island was great no question. Second half was a mess with cake plot that really didn't amount to much.
Reverie - 8.5
A good mini arc. A lot of interesting plot points, but sadly we won't get a resolution for a lot of them until later on.
Wano - 8 (so far)
Good start; the prison part dragged a bit, but the rest of the arc has been enjoyable. The flashback is really good. Can't wait to see the rest.