Kind of a high three (it's brought down by a slow start for me ... altogether too much biography, I want to plunge into the art. And once we plunged, there wasn't really enough about style, process, media, etc. so I missed a lot of the "How" in the title which I'd been expecting).
But it settled in, and I enjoyed seeing preliminary sketches. Sad to read about Growler. I still think it's marvelous that these enchanted stories are based on real toys, who survived all these years and now get to live in a prime location in New York City! They must have marvelous adventures when the library's closed for the night.
(Note: I'm a writer, so I suffer when I offer fewer than five stars. But these aren't ratings of quality, they're a subjective account of how much I liked the book: 5* = an unalloyed pleasure from start to finish, 4* = really enjoyed it, 3* = readable but not thrilling, 2* = disappointing, and 1* = hated it.)