I fianlly saw it. Not bad, but not great. One thing the movie does poorly is account for time passage. He spent years in the Wartburg, working on the German Bible, but it comes across as mere weeks. Indeed his 25 year main career is telescoped into a seeming 5-6. And a few glaring inaccuracies are distracting, like when he gives a printed copy of the German New Testement to Elector Frederick. Another, typically Hollywood, problem is that almost all the props seems new and unused: clothes, swords, money, etc.
On the other hand, the film does a good job at creating a nonmodern atmosphere. Real period buildings were probably not always available, but even the newer ones still show centuries of use, and many actual buildings were used. Ustinov is brilliant as Frederick the Wise. There are some excellent shots of carnage, which conveyed the difficult point that 100,000 dead pesants is not just a number in a book.
You see very little of Luther the debater and none of Luther the musician, both critically important. The landmark Address to the German Nobility is almost completely ignorred. Because of this you do not get a feel for how he won over the aristocracy, which is absolutely critical to his continuing survival. Also, there is no mention of the great scholar Erasmus, who gave him enormous credibility simply by finding nothing to criticize.
All in all I was left wanting more.
J