An absolute masterpiece for the very first episode of the initial series Shippuden and its later setting is one of the ways the "brand" has had such a period of success giving compelling characters and arcs as well as showing perfectly the growth of many of the individuals that create the cast. For all it's flaws (particularly related to pacing and filler) there's a thousand reasons which solidify the shows status as a deserving modern classic amongst the greatest of all time