Yes, unwatchable. And, to be as serious and even more honest, I confess I was never swept away with the overly romanticized myth of the Mountain Men (this includes that specific entitled movie as well -- so, so, bad). It's all as much glorified, sanitized, nonsense as anything else. I know this isn't appreciated here, especially by some who were influenced in their childhood by a film to buy a custom Hawken rifle as soon as they could barely afford it, but the historical characters were a handful of mouth-breathers with few if any other options in life except to exploit what they could from others and nature itself, destroying their hosts like viruses and having to push ever farther into the void to earn their bloody and menial living.
And please don't anyone start telling me about this or that exception like some third son ivy league college grad, etc., who chose to go on an adventure. I know they have some interesting stories but these men were the dregs of civilized society and the films about them couldn't be much worse IMO. And then there's Leonardo.
I think if he were as great a talent as some would have us believe he should have died for his art. Lord, hear our prayer.