If nothing else, these last couple seasons have me more excited about the books. I was worried when the show passed the books that it would essentially ruin it for me, but because of the major departures and the ham-fisted way the show has gone about telling the story I don't think the show will ruin the enjoyment of the story as written by GRRM.
Reminds me of when OL basically said he wanted the show to not end at its endpoint, but to just go on forever, and that it didn't really matter who wrote it. Well, I think we can all plainly see that writing matters. This is not a story that just writes itself.
Well he has told them the way he intends to end the books. So if you watch the last season, the end will ruin it.