I went to see Miss Potter with my wife on the weekend. I'm pleased to report that it's not too bad.
The film does set up a typically liberal set of concerns, namely the restrictiveness of class, gender, family and marriage. To the disappointment of some mainstream critics, though, the film isn't really transgressive in its politics. The upper-class family is shown to be ultimately warm and caring, albeit overly class conscious, and Beatrix Potter happily renounces her single girl philosophy when she meets the right man.
It's not an especially deep film, but it's charming, and refreshing in its lack of rancour. A good couples film.