I had never seen an episode of MI-5 until I surfed Amazon's Video on Demand (now, Amazon Instant Videos). I watched the first four seasons for free, paid to see episodes of Season 5, and now I'm almost through Season 7.I rate every year up to 7 as definitely 5-star material. The writing is strong, the acting is incredibly good, and the freshness is there, in no small part owing to the expendability of characters up to and including who I thought was the "star."Good show!! Keep it up!!Thanks, Amazon, for enhancing my life :)