I've seen quite a few films about Joan of Arc. Some I enjoyed, some were too far into the realm of Hollywood. This film was one of the most powerful I've ever seen. Using just the transcript of the actual trial, it conveys emotion and drama whilst being 100% realistic. I felt like I was witnessing the trial as it was. Often I get bored with films, but this drew me in and had me engrossed.
If you're looking for a classic hollywood action, with a brave girl charging into battle, forget this film. But, if you have the interest and patience to become absorbed in this film, you won't regret it. In my opinion Robert Bresson's best film.