I couldn't care less if the Series is diverging from the Literature: the books are not canonical texts (neither I would bother if they were); I couldn't care less about disputing which one is the chosen one: the source will always be the "best" because it was the first and it's the basis for the inspiration... well, that's subjective, but hey... I couldn't care less!
We readers and viewers have to understand that one thing is a book, another thing is an audiovisual work. Both have merits on their own and both use different languages to speak for themselves. What comes first comes first, but I couldn't care less. After all the author is blessing the series, even directing some episodes, and he is all smiles about its route, so... why whining?
What matters for me is quality, its juice - narrative with excellence. A story with layers and layers of reviving itself from the ashes, the mighty test of enduring when being hammered in flames, the plausibility of a character's metamorphosis (our own in life), the prevailing string of a persona's charisma: Shakespearean political plots vs. Humanism.
That's what you will find in this episode. Forget about hysterical plot turmoils, Hollywood agendas and frantic compasses. You'll only find a solid narrative with delightful clues for the "Wars to Come". When you reaffirm the protocols of seeing good old "Game of Thrones" again and for the 5th time the episode has already finished leaving you with a watery eye. Son of a...!