Not to side track the thread to much. Double Arts was in Jump but was dropped. The point being being in Jump dosn't always mean your a hit. They drop plenty of manga all the time due to their exacting standards.
On One Piece though, it's easily my favorite manga. Great mythos, great...everything. I mean...really...the whole world is just amazing.
OK. Well, everything that stays in JUMP is a hit due to the afformentioned standards.
And yeah, I wish they developed the countries a little more, but I love everything about it. The (art) style really grows on you.