I'll be the contrarian and say I only thought it was "ok." It was sleek and slick. Entertaining just for the great visuals and stylish period set pieces. People have compared it to Mad Men regarding look/feel and I'd agree. They did a good job of moving things along, which made it easy to watch.
The problem was that it lacked the substance and gravity of a show like Mad Men. Part of it was that they didn't devote much time or effort to character development. I'll be honest, to me it seemed to like the director was far more interested in the actress playing the character than in the character herself.
They made kind of a cursory stab at character development with the character's background and substance abuse issues, but they didn't really commit to it and it showed. I honestly never really felt like I had a firm grasp on the character anyway. She kind of flitted back and forth between some kind of autistic chess savant and a savvy socialite. They wanted the character to be everything all at once, and that type of thing makes weak characters. Again, I the show was more than exposé for the actress than a story about an interesting character.
Not terrible, but kind of like Chinese food. It tastes good going down, but you still feel kind of empty a few hours later.