Thought it had lots of greatness in it, mostly centered around the ongoing story arcs (Raylan and Boyd, Raylan and Arlo and Helen, Raylan and Winona, Boyd and Ava, Mags and the girl--fucking chilling, that one), and the central crime was certainly intense (the story about the coal train was the perfect lead-in), but there was so much going on that the "investigation" was so simple as to be uninteresting, and if the second marshal isn't going to be featured more heavily as the season goes on, I'm damned if I can figure out why the story needed him at all.
Nitpicks, I suppose, but this series has set its bar awfully high.