Well done. They did have to condense the timeline a good bit to make the story flow. For example, the McCoy killed for being a Union soldier and the stealing of the pig appeared to happen close together, while in reality they occurred roughly a decade apart. They also had to combine some characters. All of which is understandable with such a complex story line.
Yeah. I really felt they tried to stick to the story line where possible, and the changes they made were understandable and not too drastic. I was surprised that it made it seem like the Union McCoy killing started it, but while in fact it was the first blood shed, things didn't really continue after that first killing until much later.
They touched on the bitterness of Randolph McCoy towards Devil Anse Hatfield over Devil Anse being a Confederate deserter, which tied in with the timber dispute, was a driving factor of the feud. I think the possible connection between the Union/Confederate angle was easier for the average viewer to grasp.
I feel the same way about Costner. No matter what part he's playing, it's just Kevin Costner in a different costume and his Hatfield is no exception. He even does his patented 'I'll make my voice crackle and pop like a twelve year-old boy and everyone will think it's so cute' thing... which drives me freaking insane.
I did quite like the miniseries though, despite him being in it.