If you aren't watching this series, go do it now. I became absolutely hooked after only hearing about it for the first time a few months ago, and so I can't believe this is already the last season.
It has some of the best character writing I've ever seen on television. I was initially worried that the show's setting, combined with popular media's less than stellar record of depictions of Appalachian people, that the series would be composed entirely of stereotypes, but that is actually very much not the case.
It is the first popular movie or TV show I've seen where Appalachians portrayed as compelling, interesting characters, even though most of them (aside from the protagonist) are criminals. And I really haven't experienced a show that will make you care about the "bad guys" this much. Many of the series' plots cover the most important issues affecting the people of the Appalachian region, such as surface mining, government corruption, and drug use. They also tell pieces of Appalachia's often unknown history such as the stories of heroic strikers and black communities that have existed since before the civil war.
But if you don't care about all that "positive portrayal of Appalachians" stuff like I do, really do watch it for the characters. They are some of the most engrossing, multilayered characters ever created for television. Season 5 was a bit of a hiccup in some spots, but the premiere of this season (which I am going to spoil below for those who haven't seen it) definitely shows that the last one will be a very memorable one.
Holy shit that premiere. Rest in peace Dewey, ya big, lovable dumbass. It's sad to see him go, but what an episode for him to do it in. It has everything we've come to love about his character - big hair-brained schemes and huge blunders, but also a lot of emotion. And if Boyd will execute someone who he only suspects may be a traitor, what does that mean for Ava later in the season?