If Shippuden hadn't wildly jumped back and forth with flashback arcs during the war, it'd be the winner. Other than the flashback arcs, Shippuden filler does exactly what filler should do: fill gaps in the story and expand the established lore. The Twelve Guardian Shinobi, Three Tails and Six Tails arcs do this wonderfully. Then it all goes to shit when you get to the War lmao
