DT, I completely agree with your description of III as forced. That's a great characterization. For sure, some of the casting was inappropriate. But that may have been due to a lack of applicants. Of course, the screenplay wasn't the best; some of the dialogue was just plain silly and the film too long and involved.
Oli.. one point about lack of applicants...the studio wanted to make the movie, but not badly enough to pay Robert Duvall what he was worth at the time. By then Duvall had made quite a name for himself. Would a young FFC have bowed to this so easily?