Well he didn't have psychopathic Kinski to mess with everything and everybody, throwing childish tantrums over trivial things, did he. I mean the locals during filming offered to Herzog to murder him as a favor, seeing him as an evil spirit... you can't go much further than that.

I also recommend ie Dark Glow of the Mountains about Messner and Kammerlander doing properly hardcore expedition on Gasherbrums traverse in Pakistan that was never done before. He interviews them before they depart and after coming back, surviving by series of mere chances in extreme environment, pushed to absolute limits of human bodies and minds. Since I do a bit of mountaineering I can truly appreciate characters and the insights that no hollywood fantasies can ever come close to. True documentaries.

A bit controversial sidenote - these are the efforts that I have huge respect for, not doing it for the money, not chasing sponsors with every move. Seeing some world championships or olympics I can't have much respect for those very rich sportsmen who are focusing more on chasing new sponsors than actual spirit of the game.