Season 1 of Justified was okay. The pilot episode was fantastic and the rest of the season just kind of picked and chose things it wanted to use for later seasons. It paid off more later.
Seasons 2 and 3 were completely underrated. They had fantastic characters, they had moving parts, they had great acting, great writing, great everything.
Season 4 had some of the goods and the most ambitious plot yet, but didn't quite nail the characters.