His previous films were cheap sentimental fluff that normal hipsters dig, and I better remember his stellar animation of clouds or rain effects than the plot. He is overrated because fans love the feeling of his works, and overlook the incoherence. Even if it didn't have a reputation for being "amAzing1y gud!" I would be obliged to watch it because the director is influential, and its popularity means there will be a fad of lesser derivatives within tg media/porn for years.