There is no doubt that one piece is awesome if we talk about the story. The universe is attracting, characters are lovable and it follows a certain logic that fit perfectly the shounen manga world, from this point of view you will definitly have a hard time finding a manga with such big and coherant world and at the same time light-hearted. So story 8/10.
[IF YOU DIDN'T WATCH ONE PIECE PASS ONTO THE NEXT PARAGRAPH BECAUSE IT HINT ABOUT THE STORY]
The only problem that i could spot in the story is the recent developpement of
Sanji,Usopp and Brook. The author has quite ignored sanji and brook, and make usopp a good for nothing, succeeding in enormous proportions because of his luck and not his will to become a great pirate. And that sacrifice of the character only for some gags that are not funny is in my point of view very absurd. If we were 5 Years in the past and you were telling me Usopp's storyline from the dressrosa Arc, i'm not sure if i would want to talk with you again...
For the character developpement, i'm sadened that the author of the pillar of the shounen world (so children story) actually has the systematic tendency to over-sexualise the body of the women in his story. The binary vision of the pretty women with big boobs and a perfect waist in the opposite of the ugly women is really disturbing and can opress the lector. Because of these two point i gave 6/10 note for Characters.
Soundtrack is awesome and voice characters too so : 8/10.
When in the vast majority of anime adaptations the anime make the story even more interesting and pretty. One piece is the exact inverse case. From static plans being abused to bad drawings, bad and awfully long animations and a pacing utterly slow, the dynamics of fights is impacted negatively.
It's because the studio has make the awfull choice to animate one chapter per episode, have you seen in an anime a character yelling 2 times in the same scene his attack's name, then you haven't seen one piece anime.
Some scene are very far from being honest with the manga. So i put 1/10 for the Art.
Overall, don't lose your time watching one piece anime, buy the books you'll definitly enjoy better the story. I put 1/10 Overall because i think 8/10 for this anime is defintely too much, i would put 4/10, but my opinion is that this anime does not represent the manga correctly. It's not for nothing that a project named "One pace" (Removing all sort of bad scene) exist for this series.
