Well you canīt realy say that tenten is 4 kids, with all the gore and nudety going on and saying itīs junk is a bit harsh (but understandable).
Naruto on the other hand is the defenition of a kids manga/ anime, itīs dragonball2 for crying out loud. comparing OP to Doreamon is like comparing Naruto to Teletubbies (exept there the characters are equally retarded and the repetition and predictability of the plot is about the same(so actually, comparing them makes more sense)).
People die =/= shounen
People die =/= good story
People die =/= mature content (People die in most disney movies.....)
One Piece is good just the way it is. Makes you happy, stays fresh, fun and exciting, has lotīs of interesting characters and itīs (mostly) unpredictable.
-Whale....Lion...? ....no..hmmm...elephant?......fish? ....Mom what do I have again?