I don't really have a big problem with Arya killing NK in the show. They've pretty clearly gone away from all the prophecies and such that GRRM laid down in the books, making the show its own entity with its own story. Like some of you have said, though, not having Jon & NK at least face off one-on-one was a big mistake.

I think my problem with Dany's heel turn is that it was so sudden. And in some ways, I don't feel like it's a true heel turn. At least, I'm hoping it isn't. I think it was just her boiling over from all the emotions and circumstances she's had to deal with, especially since landing in Westeros. She's angry and heartbroken from the death of Missandei. Heartbroken at the death of Jorah. Angry & heartbroken over the deaths of 2 of her "children," the dragons. Conflicted about Jon being the true heir to the Iron Throne. Frustrated that Jon, despite what he says, is unable to return her feelings in a physical way. I don't think she ever intended to attack the civilian population of the city the way she did, but in that moment, she needed to release all the emotions churning inside her. And in doing that, she went too far. I'm still hoping she'll show some remorse about what she did and try to make amends.

But like I said above, I'm fully prepared to be disappointed Sunday night. D&D seem lost with how to resolve this without GRRM to guide them.