Cause it is damn good this season. Spoilers
I love that this season more than any other has showcased how dark Raylan has become in pursuit in putting away (or putting down) assholes he doesn't like. Now I'm just wondering what he is going to lose in next weeks season finale. Over the series he has lost his step mother, father, relationship to his baby momma, and now his relationship with Art.
Also I love how desperate Boyd has become now that nothing is working out for him, and not for lack of trying but nothing he tries succeeds. Not even his infamous silver tongue can get him out of this mess. Bless Tim Gutterson for getting some of my favorite lines in the series. And can Timothy Olyphant get anymore swoon worthy hot damn he ages like a fine wine.