Is one piece bad because it's designs are diverse? No One Piece's cartoony and varied style is part of what sets it apart from every anime. And having diverse and varied designs doesn't mean there won't also be more standard designs. One piece does all of it and does it well. Its is a master of diversity of designs so he is a terrible example.
Oda has a type and draws lots of women with sexy hourglass bodies but that's not all his women. There are plenty of women in one piece who are not attractive at all. It's all about variety.