As a period drama, it stood head and shoulders over the likes of Rome, Cranford, Deadwood or Bleak House. It hearkened back to the skills of seventies drama, now all but lost, of slow, considered storytelling. Full of morally flawed characters, trapped in cages only visible from a future vantage point, and the time and consideration to allow entire episodes to address one simple theme at a time. Gorgeous.
It had less to do with advertising than The Creatives, but which would you rather watch?