Well, that is not a bad thing in my opinion. Sure, it will require time, but it also leaves great room for character development, story twists, etc.. If you don't get caught directly I can understand, but once you get going and have watched a fair amount, it's really good. And for me it has only gotten better with each arc...
(On One Piece) Well I was no fan of the drawing myself (still am not), but after a while you notice it less. I just love the story now and how they can build up momentum is truly magnificent. Kudos to the maker. ^^