I found the movie quite interesting as this is a world I know very little about. I have a couple of friends who are, or were, in the horse world, and I imagine that this gave me some insight into what attracts them to it. The NYT liked it too, probably a bit more than I did.
I should note that we went to this partly on the theory that our four-year-old would like it. She did not; there was too much talk and not enough plot for her taste.