Just finished watching for the third time. Kate Winslet is just stunning in this, but she's also surrounded by a top notch, ensemble, supporting cast. The score is beautiful and compelling, rather than obvious and spoilly. The setting is so authentic that you feel like you're in their world and you've met these people. The series is so well written and played that it's as if you've read a great novel.
There are only maybe two brief scenes involving nudity, a handful of scenes including violence, with one very intense sequence. There are curse words throughout, but often spoken in passing rather than exclaimed during action scenes. Alcohol and smoking are very prevalent, and one episode shows illegal drugs on screen but not in use.