The triumvirate of directing, writing, and acting was completely out of whack in this film and the bulk of the blame goes to the director. Despite the poorly written script, the actors manage to pull off some believability, but the overall film is otherwise an epic fail of bad directing, editing, and historical detailing.
The movie tries to take on too much and fails on all counts of telling anyone's side of the story. The most impressive part of the film is how a young director managed to get so many capable actors and find the money to green light this project.
I think the biggest surprise is how the costuming was so badly done. 1969 has to be one of the easiest time periods to recreate since there is a ton of the clothes from the period still available, it's cheap and easy to find, and there are loads of images to study. The slap dash costuming is just a symptom of the very poor effort put into this film.