Yeah some of the arcs, especially few of the earlier ones, seemed to drag on for too long. I see what you'e saying.
Oh, Marineford is probably my favorite arc of the entire series so far. I love how it brought back so many characters; it was such a great arc. I would say more, but I don't want to ruin too much for ya. Omg I just looked it up, and episodes 475 was one of my favorite episodes of that arc. Brings back memories, I may watch it again. xD