In British terms it's a conservative series. The creator, Julian Fellowes, is a Tory peer and the son-in-law of an Earl.
Decades ago, there was the same enthusiasm about Upstairs, Downstairs. Shows like this tap into something about human nature that isn't going to go way. But the production quality is much higher than those old series shot in studios on videotape.
My wife likes it, and I enjoy "watching" it with her.