I was going to put this on my Netflix queue but everyone keeps saying how it comes off flat and unconvincing, like a bunch of modern actors plying dress-up. I guess the moral of the story there is, Deadwood is easier said than done, huh?
I've read a lot of first person accounts from the Civil War and although I'm sure written language was different from spoken - a lot fewer obscenities for starters - its often very vivid and engaging. Maybe the writers just need to read more from the era and start to absorb more of the flavor of the time. The Deadwood approach is unlikely to be an option since it requires a unique sort of talent to come up with such inventive obscenities.