the last good moment (aside from the visuals) came from what GRRM told them --> HODOR. I don't think the story itself is a problem. But the adaptation of the story. As soon as the books didn't spell it out completely, D&D were out of their debt. Like if you check Daenaerys story, she always sounds like a megalomaniac. So her fall from grace isn't so weird. What was bad was Jon Snow story who i think is going to be the real hero against the Night King in the books was usurped by the writers of the show for feminist movement and Arya shock (as per their video youtube comment). Add Bran whose role seems to be merlin to Jon's arthur suddenly being tranformed out of nowhere to be king cause what else where they going to do with him after they changed Night King story. Jon Snow exile cause of some minor character.... all that seemed bogus.
The Epic battle by Candlelight pretty much did it for me.