We didn't see any depth or interest to Brom. Hence, stereotype.

One might point out that at the start Alma is equally stereotypical and on the face of it just as unlikely to last long in Deadwood.

All this shows is that you don't understand the meaning of the term 'worldbuilding'

Would you care to provide a definition, cos I doubt you think the person who wrote the Wikipedia page does either. Unless you're of the opinion that the show would be immeasurably improved by including maps and historical notes with the DVDs. :P