Well, the profanity didn't bother me at all. A few weeks of military boot camp will cure one of that. It was mostly a lot of "cake"suckers, most notably "San Francisco cakesucker!"
And I enjoyed the formal, rather stilted, language. I kept wondering if people on the edges of civilization really spoke like that. They didn't in
Firefly ! Except maybe Simon in the first episode or two.
I also wondered how much that was said about George Hearst was true. Wikipedia (!) confirms some of it, but nothing about his being a murderer. Apparently he was a very accomplished geologist and was later a congressman.
What surprised me is that almost all of the main characters were true from history. When I first started watching I figured just Wild Bill Hickok, his killer, and Calamity Jane. Nope.