This is one of my favorite books, and I generally have very low expectations of any adaptation, so I went in to this with that mentality. It isn't perfect, but it feels like it's coming from the same place as the book, with the same themes driving the plot and characters (who are very well cast).
The source material covers a lot of ground, literally and figuratively. I've only seen four episodes, but I have been pleasantly surprised at the world and character building. I'm a little more concerned about how they will handle later events, as the story continues and women take power over the new world.
All in all, it's better than I expected and I'm excited to watch the rest.
