I think the point stands though that the writers of the show aren't as skilled at dialogue as GRRM. There is like... one great monologue an episode by characters in the first season, if not more than one. I literally fast-forwarded through some of the monologues in the latter part of season six.
I think the show in the latter season mostly stands on being a very loyal representation in a visual medium specifically. HBO has gotten very good at portrayal over the seasons, which is why the whole opening of the S6 finale can communicate so much with almost no words (though, kudos, Margaery, strong out but you still got played). It's analogous to Martin and Bakker building up so many disparate pieces of their world so they can better wield the associations later - how else can something like the lingering shot of the Sept of Baelor covered in wildfire even work?
I got a used copy of AGOT again so we'll see if I make it farther than halfway through TSOS this time.