One Piece is more a mainstream anime than Naruto & Bleach.
Both Naruto & Bleach are more for audience between the age of 12~18, One Piece is more open for all ages, not to mention "strange", which is the reason attracting more audience. Detective Conan is the nearest to One Piece in Japan's TV Rankings, both series feature strange un-expected fantasy characters and events.
In fact, One Piece has audience rating from 10~13 (2002~2006) in Japan, currently it's the 4th in the Japanese Audience Rating's Anime lists.
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