Arrietty is too the last movie I saw and I was greatly disappointed, sorry to say that.
It may be the most beautiful anime movie I've ever seen (and I've seen really lots of them) but the story is poor, the characters are superficial. Ghibli magic is not there, and it's all the more damageable that the world in which it happens was really promising. I really think it could have been terrific with better story and characters developments (it's tha PSIII of Ghibli's movies

).
Not the worst Ghibli (it's "Neko no ongaeshi" (I don't know the english title, french is "Le Royaume des Chats")), not a bad film (it's a Ghibli, no doubt about it) but really far from Masterpieces such as Mononoke, or Spirited Away, or Totoro, or Tombstone of the Fireflies (My preference is to Porco Rosso, but it's personal).