I was late to the party with this show. After a stuttering start over a period of time, I watched past episode 1 (I generally can't stand anything western related), I was totally engrossed a few episodes in. It must be noted that the theme tune is one of the best out there and so well suited to the show. Season 1 builds to a great finale, season 2 builds upon this with a cracking ending. I approached season 3 with an open mind after hearing mixed reviews, I'm glad I did as it continues the story in spectacular fashion.
The casting is superb, the production values incredible and the story is very well paced. Bring on season 4!