Old-school U.S. Marshal Raylan Givens is reassigned from Miami to his hometown of Harlan, Kentucky. He enforces his own brand of justice there and his body count was matched only by his grudging devotion to the law.
One of the many reasons why Justified is so good is the fact that no matter how convoluted the relations among the series' characters appear in retrospect, they never feel as such (at least to excess) while watching.
The great thing about Justified is the way it fills itself with characters who live and die by a code that strives to keep even the most dastardly of characters from crossing some sort of ethical or moral line they have put down for themselves.
I'm still enjoying the hell out of Justified, and the upside of my quibbles here is that there's so much good to work with: there's nothing wrong with Justified that can't be fixed by the many, many things that are right with Justified.