There is absolutely nothing groundbreaking about the show, but it is enjoyable, well acted, interesting, and the perfect length at seven episodes. I did not read the source material yet, but I never compare books and movies for the sake of determining which one was "better", so that really doesn't matter to me anyway. I've always loved Annette Benning and Sam Neill, and both have certainly become better with age! The rest of the cast supports them well.
As for the low scores... completely ridiculous. I probably would've rated this a 7, but I gave it an extra point just to counter some of the unfair reviewers. One person in particular rates it a 2, and goes off about Hollywood culture war, blah blah, rich white people are being demonized blah blah. Well, I'm white, and I don't see that at all. Some people just need to get a life.