This anime should be only behind dragon ball Z. Dragon Ball z is number because it changed the way anime should be and opened the doors to One Piece itself. One Piece on the other hand took over from Dragon Ball Z and removed all the negatives of DBZ. There is no other anime that has a better story line, character development, story pregression logical progression and no inconsistencies in the story. Anybody who rate OP behind Naruto certainly has not seen OP in its entirety, yes it starts slow but damn it gets better and better, the most amazing thing about it is that the best is yet to come. Unlike anime that starts hot but fade as the author has ran out ideas trying to prolong the story resulting in diminished quality.