A "smaller-scale" Ghibli movie than what we're used to, but a good one. The Secret World of Arrietty is the story of a family of "borrowers" a tiny race of people who live within the homes of ordinary humans and who are supposed to stay hidden from them at all times.
It's visually as beautiful as you'd expect from Ghibli, with even simple backgrounds looking as lovely as a painting. Instead of the fantastical lands of most Ghibli films like Spirited Away or Howl's Moving Castle, The Secret World of Arrietty is set in an ordinary home. But the simple beauty of everything and seeing the lovingly-drawn detail in everyday items from the view of smaller eyes makes this one of the more memorable Ghibli movies from a visual standpoint, in my opinion.
As for the story, it's simple and effective, and deals with nothing more than the human occupants of a home, including a young boy with a heart condition, and the family of borrowers that also lives there unknown. Arrietty herself, the daughter of the family of tiny people, continues the tradition of fantastic female characters that comes from Studio Ghibli.
This isn't an action-packed movie with a grand climax or anything like that, but I found it satisfying and pleasantly watchable. Arrietty left me with good feelings and avoided being heavy-handed with messages as some Ghibli movies can tend to do. I liked it a lot (better than Howl's Moving Castle and Tales from Earthsea, if not quite as much as Ponyo), and I'll be happily seeing it again at the theater when it comes out in the U.S.