one piece is soo epic! it's really about a struggle of power, oppression, and corruption of the government and outside forces, as well as exploring the perception of right wrong and justice, and how it depends on perspective.
but i can't watch one piece and enjoy it as much as i would like. simply because i read the manga, and the manga is just so epic and beautiful at times! so much so the anime could never compare unless they blow fat stacks out the window at a stupid pace!!! probably the best example of this right now is the water7 arc toonami is airing now. the entire atmosphere is lost, the wind just isn't shown like in the manga.