It's an interesting story. But more interesting is the choice made by Philippa Lowthorpe, the director. She shot everything documentary-style. Even to the point of having the main characters –– and we're talking people from the 1500's –– speaking to camera as if they're being interviewed, complete with jump cuts that compress the quotes.
I can't say that I liked the choice. In fact, I hated it. It took me completely out of the story and felt as if I were watching a rehearsal rather than a film. But you have to admit it was a brave thing to do.
All in all, I'd call it a spectacular failure.
Maybe it's just me, but I'll take a spectacular failure over a mediocre success.