The first season is exciting to watch - the characters, the costumes, the story, the humour, the pathos... it's great! However, season is a mess. Eileen Atkins refused to return because she didn't like the scripts for season 2, and she was right. The first couple of episodes are okay, but when the writers ran out of ideas they dredged up some non-sequitur throw-away stories that include a lesbian affair and a boxing match that have no overall impact on the story. The last two episodes are dark and depressing and rush towards an unsatisfying conclusion. My advice is watch season one as a movie in three parts and pretend season 2 was never made...
