History is far too complex and contradictory to accurately portay in film. That's what documentaries are for, and even then they only start to tell the story. I happen to think it was a highly entertaining movie, and great peice of story-telling. I only rarely go to the movies to see historical commentary, if I want that I will watch the History Channel. They did a superior and entertaining show on the development of the sword that was awesome.
History is far too complex and contradictory to accurately portay in film.
That's what documentaries are for, and even then they only start to tell the story.