Have you actually seen One piece, to make such assumptions? Apart from the fillers (which are actually better then you think) the anime faithually follows the manga adaption.
Eh, I've seen bits and pieces of it, since someone I know is kind of obsessed with it. Not saying it's bad, but unless it had amazing animation or something, I wouldn't really be willing to watch it anyway since I feel OP works better in manga format.
I think this can been considered as "amazing animation"
Ha, well it's easy to just watch the fights if they're good. I stopped watching Naruto around ep 80 but I managed to catch parts of this (surprisingly good for late Naruto eps)
Well, I tend to like odd stuff anyways. The last anime I watched that I really loved was Lucky Star... (not that I've watched more than 2 since then).