As broad entertainment it works on many levels, but there are also many inconsistencies and unanswered threads which stretch believability.
For Onion, the gender issue is never plausibly explored, and his reveal at the end in the cell, where JB insinuates "he doesn't care what clothes he wears" papers over what obviously supersedes "clothing".
Onion's embrace of the forced gender role never rang true, particularly since he kept it going from situation to situation throughout. Did he ever take a bath with the girls?
Why wouldn't he have been forced to work upstairs in such a mercenary, exploitative place as that saloon? He would have, and he would have been torn up, as he would have been in a much less tolerable environment then portrayed and even though the writers try to explain it here and there to lend it a credibility, it never reaches any sustainability.
It also would never have happened the way it did. Likeable actor though!
E. Hawkes screeching at times teeters on overact. In fact the whole show seems a bit Tarantino-ish in it's over the top liberties taken here and there for situational effect.
It asks a lot of an audience to go along and overlook these sub-constructs, and the more it asks, the less effective the story becomes.
The shows most powerful moments are the scenes of naked racism and an awe at just how awful slaves were treated and spoken to. In these scenes, there isn't any need to embellish or hyperbolize - the simple dialogue displays an amazingly horrifying snapshot of the times.
It's a wild ride, full of raunch and color, and in many ways sad and funny but as a straight up re-telling of events, it doesn't pass muster, that is, if one is to think that JB wasn't delusional. Moreover, the style of using over-the-top humor and broadsides with colorful characters dilutes the power of his story.
R