I read a couple of the books and honestly found them to be a tedious slog. I read them before the shows and actually thought they would be better as a TV show/movie.
I find Martin's descriptive writing painfully slow as it is so painstaking in it's detail. Plot, character, dialogue etc are all fine, I just can't handle the never ending pages of describing every detail of what everyone is wearing.
I recall the parade leading up to a tournament. Every participant had their armour, shield, cloak, stitching, sword, horse, coat of arms, hair, saddle etc explained in great detail. As it went on for person after person, page after page I found myself bored to tears.