Oda: He knows where he is going, even when we don't like it. The pacing is clearly voluntary, Oda builds his world piece by piece, inserting hints here and there and involving different characters into non-fighting plots. If he starts doing the manga as others want him to do, he loses, so he rather stick to his guns. Oda believes that action can be a focus in the manga even when his heroes aren't in physical danger, apparently the fans don't agree. The worldbuilding is among the best I've seen.
Kishi: Gravitas, creepiness and scope actually work in his book. He proposes an interesting world with deep powersets and emotional characters. Sadly, he constantly does too much. He gives his characters too many abilities -instead of using just a few powers creatively-, he shifts focuses in a rather drastical fashion and abandons his own characters, he powerscales way too much -as of late- ruining partially the inherent interest of his worlds. When he restrains himself, his book is really fun and his caracterizations are good.
Yasuhisa Hara: The drama man. He can write a scene of just people talking and put so much weight on it that it becomes a "ph_ck yeah" moment. Good work on writting about tactics and general strategy, even when outcomes are more or less predictable you really enjoy the path that leads to them. You see characters from the outside, they don't develop that much, but it works excellently. Sometimes his characters are just too good for their own wellbeing, it makes for some anticlimactic moments.
I won't talk about the art, because they are all rather good. Oda has the more flagrant weak days and sometimes his panels are just weird. In Naruto there is something odd about some action sequences, but those are hard to depict so I won't be too picky. Hara has some weird art with odd proportions, and the one-on-one battle scences tend to be a bit repetitive.