I started watching the show not knowing that it was based on a book, I found the constant nudity and swearing annoying - as it suggested "the story is rubbish, but look boobies!!!" and the swearing was just stupid, if you're going to swear, then swear properly, don't just chuck the F word in for the sake of it!
I bought the book in order to find out what the "backstory" was and although they've stuck to the book very closely, I found the not telling us everything a bit annoying, like Viserys and Daenaerys being from a family of incestuous parenting (therefore making Viserys insane) - if I'd known that, then the whole selling his sister to a warlord would have made a lot more sense!
I haven't been able to watch any more of the show as my mother has dementia and she got hysterical at the nudity/sex and foul language
I have read most of the book now, and I find it rather annoying going from one character to the other and back again...