That pretty much describes DBZ , highly overrated piece of crap.
Yeah! I wish Dragon Ball was never made! Don't you agree?
After much thought on the topic (how could I avoid it, it's always at the friggin' top of the Manga Board) I have decided that no matter what the definition of a masterpiece is and no matter what I think about it…there's no way anyone can tell yet.
Why?
Because it's not finished silly.
"But Greg, Mona Lisa isn't finished!"
Yeah, big difference there. Leonardo kind of died before he completed it.
Even though 99.9% of the evidence could be to the contrary, it remains to be seen what will happen with the story and Oda could easily jump the SHIT out of the shark if he takes a wrong step. He already came very close during one part in particular IMHO but he rebounded.
Therefore whether it may be considered a 'masterpiece' by definition within its genre is something none of us should have the right to decide.
We can like the shit out of it, but declaring an on-going work a masterpiece? Not a good thing.