If you wanna talk art Fairy Tail art shits on One Piece. I don't like art that looks too cartoony. One Piece art is like that. I could careless which other art is better. I enjoy all kinds of anime art. Just not those that look too obvious to cartoony.
Like I said art, while definitely a factor, is not what will put one series above the other though. One Piece's art is definitely the series' weak point, which probably is what prevented it from growing bigger when it has such a ridiculously well written story. The other main problem, definitely not as prominent as the art, is the whole formula it seems follow with certain arcs, what with each member taking on a bad guy and the protagonist taking on the strongest bad guy only for them to go for another island, but that aside I can't really think of any big flaws of One Piece. Which is definitely more than I can say for any long running series like Naruto and Bleach.
I'm getting off track though. The point I'm trying to get is.....yeah, One Piece's art is not the best. but that hardly matters when everything else serves to strongly compensate for it.
I have watched that to. I liked it. Its only 12 episodes so I don't compare it with long running series. Its just not fair.
Well, I was talking about the manga, which is well past its 100's which should give the anime a bit over three seasons worth of content alone...but fair point.