Saving Mr. Banks
Mary Poppins is one of my favorites, so I was happy to see this. It's a surprisingly dark entry into its origins.
What can I say? It takes liberties, for sure, but it's thoroughly enjoyable. I love BJ Novak and Schwartzman as the Sherman Bros., Emma Thompson as Travers, and especially Tom Hanks as Disney.
I recommend you see it, but the experience is made better if you've seen the films, and even moreso (IMO) if you've read one of the books (which I have).
10/10 WILL watch again.