I just finished watching the first 3 seasons on Netflix last night.  AMC is playing the whole series in order at 3am and 4am Pacific time right now, until the July 15 start of Season 5.
I watched the first episode and was hooked.  I started watching five or six episodes per day 'til I finished the third season.  Great show really.  My only complaint is that they killed off Jane.  I hate it when a fine ass women goes to waste. Ha!  
Really though, I can't wait to watch season 4 and prepare for the fifth and apparently final season.