Got to season 5 in my rewatching, and there is such a massive difference in the writing between seasons 1-4 and 5. 5 is where the writing became awful, and I'm left going "what the fuck?" several times an episode now.
Been long since I read the books, but I wonder if that's where they left the book material behind? I know the Daenerys storyline has quite a lot of stuff in the books that was cut from the show so I can't tell.