They nailed the characters, the story beats, the villains, costumes, everything. I was skeptical after season 2 though I'm not a book purist, but they really know what they're doing. Even constrained by the stupid 8 episode per season limit by Amazon.
And that episode this season is probably one of the best episodes of fantasy television.
Honestly, I just dislike his writing style. I don't think the pages sings with his words like other authors do. I feel that it's wordy for the sake of using words and has absolutely no sense of rhythm.
I know a lot of people like it but it just does nothing for me. I'd rather read anything by pascal quignard than jordans.
I also dislike Tolkien's writing style... I know, I know... To be fair it's mostly a me problem