There is no one definitive answer to this question, as different people have different opinions. However, some people believe that Naruto is the worst Shonen anime, due to its excessive violence and sexual content. Others may argue that Bleach is the worst due to its dark and twisted plotlines. So, it really depends on your personal taste in anime!
There is no one answer to this question as everyone has their own opinions. That being said, some people may consider some of the more recent Shonen anime to be among the worst. Names that may come up include Death Note, Naruto Shippuden, and One Piece.