Interesting, but not the best of its kind
This isn't in the league of film-project-gone-wrong documentaries like Jodorowsky's Dune or Lost in La Mancha, but it is interesting enough, showing how a project disintegrates.
The main impression I get was that there was a lack of preparation and planning, on everyone's part. The production company attached people without properly thinking about how it would work, the director jumped in with a willingness to accept any compromise and an inexperience that left him at the mercy of actors, etc.
This system Hollywood has of taking someone as soon as they show promise and making them responsible for major productions, is just stupid. Used to be you worked your way up. Now people are thrust into top positions completely unprepared and allowed to sink or swim. Few swim.
The most egregious thing really was amping the project up simply because they were able to attach people who bring more money to the job. Why do you want Brando for the role? Because he'd be good in it? NO, because he'd bring more money - which will go to him. It's not even motivated by greed because the profitability doesn't increase - in fact it makes the whole thing more of a gamble. It's inflating the project just for the sake of inflating it.