I'm not a fan of the television series, but do enjoy the books
I enjoyed the first few, but the latest book was rubbish and I've entirely lost interest in the story thanks to the pace of his writing. He doesn't seem to have much in the way of original plot ideas, so it's mostly about character moments, and you have to keep that sort of writing coming for me to stay interested in those characters.
The series, however, I rather enjoy. While it's probably the first series to ever make me say "there is such a thing as too much gratuitous nudity", the pacing is vastly better than the books, the important character moments are all there, and the gaps between seasons aren't so long that I forget who everyone is.