Yeah, Justified has a LOT of great villains. When Quarles gives his origin story... damn. I had to check what show I was watching because it reminded me so much of "Dexter" (in the best possible way -- that show had some of the best villains in the history of TV). I don't know what it was about season 2 that seemed more rounded out, though... better paced, with more of a coherent arc, for everyone involved. Maybe I'm romanticizing it after the fact though. I should watch it again to see if I'm remembering it correctly.

You see him as Ne-dom? He is silver-tongued, but I just never got that type of energy from him.
The bolded is such an interesting dynamic. I'm wondering if/when Raylan will ever see the commonalities and gray areas that Boyd, and pretty much every Justified viewer, started seeing a long time ago.
Don't get me wrong, I LOVED the second season. If I HAD to choose a favorite, that might be it. But I usually watch shows more narrowly, like the overarching story doesn't matter AS much to me, mostly how all the characters interact.
I think part of Raylans problem is (and don't get me wrong, I love just about everything about him, except his hate for Boyd, and really just rudeness) that because his dad was such a shitbag (fucking tried to kill his son twice) he strives hard, maybe even blindly, to be a good lawman.
Boyd is a brilliant improvisor and has had many identities. Rather typical ENTP. He can think on the fly, size up situations and people lightening fast, clever, cunning. Like the cigarette box with the Emulex. He pretty much outwits everyone, even when he is lower in numbers. And is pretty devoid of emotion. Only a handful of times we see him really pissed, when Ava got shot, and when that miner kept pushing him to go back to being a criminal, he holds his head in the car and drives. That scene was awesome "OH JESUS CHRIST" Boyd: "You wanna talk about Jesus, Kyle?! We can talk about Jesus!" hahaha
Quarles is scary as hell, they did a good job finding someone to take our minds off how awesome Mags was.
"And what if the man in that car had brilliant blue eyes?" Wynn: "And a big stupid baby head?"
What kind of energy do you get from 'ol Boyd?
There's more links on the types of characters on the show, but here's one:
http://personalitycafe.com/guess-type/150357-justified-fx.html