I enjoyed Hatfields & McCoys except for one thing: The audio in the first segment was horrible. So bad in fact that most of my friends turned it off after 30 minutes because they couldn't understand what the actors were saying. The plot, especially in the beginning was very important to the rest of the story, and there were so many characters involved that if you didn't know what they said, you were lost. The biggest issue was the mumbling of the actors, combined with what appeared to be lousy sound pick-up. Further along into part one, the audio seemed to clear up and the actors stopped mumbling for the most part. The second and third parts of the series were much better, audio wise.
Be aware that I am from southern WV, and while it may be hard for people outside this area to understand the dialect, it isn't for me. The early mumbling and audio was just bad.
Now, as far as the rest of the movie: I give it a 7, which is high for me. I'm glad to see the fact that these people weren't portrayed as stupid barefoot hillbillies. Check the history of Devil Anse on the Net and you'll find out that he was smart, wealthy, and the family turned out doctors and lawyers and governors. All in all, I like the show.