Season 1 sits up there in my very exclusive "Perfect Season" group.
Right next to Season 4 of The Wire, Season 2 of Carnivale, Season 1 of Deadwood, Season 3 of Breaking Bad, Season 5 of The Sopranos... perfect runs of episodes with no crap, no filler, no poor or weak episodes, just pure book-style storytelling.
Though Season 4 was pretty damned stellar too.
Now, as I've not watched it yet... onto Season 5!!
Hugo - Clear Minds, Full Hearts, Can't Lose!