I envy you. Watching the show for the first time is a great experience. I did it, then I got to experience it when my wife watched them all with me and got hooked herself. There are a lot of haters, but it really is a great show.
I started watching first, then rewatched when hubby started watching. I want to start them again, you catch more each time. He is reading the books now, pretty much as a separate thing all together for what they are. He hasn't said much about the differences, just mentioned that they went totally different directions with some storylines.