FanFiction from some random person on Tumblr is one thing but GRRM giving D&D full reigns to adapt his story isn't considered FanFic, imo
Sansa's story is more intriguing on GoT than the books.
I feel the WhiteWalkers (Others) are handled better on the show than the books. Hardhome episode specifically.
I definitely know I'm in the minority but I didn't care for Lady Stoneheart in the books and was pleased D&D didn't include her in the series.
Also, I feel GRRM is chasing his tail as far as trying to tie all these plot lines together and that's why Winds was delayed. There's an article I read where someone goes more in depth but maybe, and let me emphasis that, maybe George hit a wall.
Let me preference this by saying I'm not looking to argue nor debate. If you disagree, cool. If you agree, I'll be shocked but that's cool too.