Upstairs, Downstairs(1971-1975) is a masterpiece.

I know the filming style is jarring for people more used to the modern slick style, but once you get into it you start to appreciate the writing and acting. What's especially appealing is the sociological comment happening about how society mistreats the downstairs people, especially in the episode I Dies of Love which I won't spoil, but is devastating and wouldn't work if done in a Downton Abbey style.

I really have learned to appreciate the 1970s BBC theatrical style and minimal sets of shows like Upstairs, Downstairs, I Claudius, The Duchess of Duke Street. After watching those, it's so jarring to watch the modern shows with the slick cinematography and short cuts. I wish we'd return to that style.