Because GRRM is genius D&D are not even close, you can't expect they keep same level of writing as when they have books to fallow and when GRRM was involved in show. You can't expect show to came even close to books, differences between mediums is to big for this kind of story. For me books are serious read and I love every chapter of it. Show is fun, I don't take it to serious, good visuals, usually good acting, some times great directing, like last two episodes, Sunday night fun. Sometimes I'm pissed with unused potential, but I try to separate it from books as far as I can. Surely even for TV show they have flaws that can't be justified(Arya stupidity from 7th episode).