This is an almost Chekhovian western
Shootings punctuate it, but most of it consists of small, underplayed human interactions by an ensemble of varied characters in a circumscribed place, and a spattering of non har-de-har character comedy. And the acting is mostly (Brennan excepted, of course) very unshowy and finely judged. Rick Nelson, in my opinion, doesn't even make the smallest mistake. He's not big on the screen in any way, and he needs all the others to play off, but he holds up his end extremely well.
The Republican Plan: repeal all reform; collect payoffs; go yachting (but not in the Gulf).