Some improves the story but some important things are missing. They have so badly fucked up the Jon Snow story line its almost unwatchable for someone who has read the books. The other one is the Dany story line, while different from the books it was close enough to keep true to the author's intent. But as of the last two episodes they are just making stuff up....
I guess it's frustrating in the cases where they change it so much it changes the nature of the character involved, again primarily because of motivations. This whole story is about character motivation, to change things up makes characters very different from book to TV series.
Id also say the walking dead is a different deal. It has always been loosely based on a comic book series (my understanding). Like all the superhero movies they have taken elements of story lines and characters and create their own work of fiction. But a song of ice and fire is a rich and well thought out story that translates well to the screen in most cases. Up until recently it was handled similarly to the LotR movies. Where, yes, they condensed things and got rid of sidetrack storylines that didnt translate well to a screenplay, but for the most part followed the story closely and included all important elements true to the books. That's how they started GoT so i guess its hard to understand why they would change the approach more than a season into it.
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