The character they failed the most
For so long I have blamed the downfall of the show from first the inability to capture the vast nature of the novels and then on the lack of source material. However, this latest installment made clear that the fault is truly on the Double D's as it was not the story they were telling that was so cring-y but them undoing the arcs of these character that took hours of television and thousands of pages to capture.
This most grievous case is found in the character of Jaime. Jaime Lannister, has in some ways, the most compelling and transformation arc of any character in the entire series. He drives himself to be better not through a miracle of bringing 3 dragons into the world, or by becoming a quasi magic assassin, but because he's done bad things and really truly wants to be better. Jaime's shift away from Cersei and move towards Brienne shows him choosing a life of doing good and contributing to a purpose larger than the Lannister name, and shallow love and adoration. Jaime looking Cersei in the eye and saying, "I don't believe you." cemented his path, he is in my opinion the most human character in the series - a man who is given everything, only to lose it, and rebuild himself as a true Knight. I think in a sense Jaime's Knighting of Brienne represented his cleansing and forgiving himself for the murder of Aerys Targarean and rising a better man. His relationship with Brienne did not need to become physically romantic, especially if they intended for him to die with Cersei, but it also simply did not make their relationship more compelling. Their relationship was so interesting because it was based in respect of character and not on physical attributes, to have them consummate this union only happened for the version of Jaime to be able to realize he is a conceded excuse of a Knight after all. Jaime dies the Kingslayer with near no one understanding what he did to save them during the fall of Aerys, and we're expected to believe this same man's main objective during Daenerys' attack is to fight some guy for banging his sister, really?
Jaime's journey back to Cersei undid every single moment of his character starting episode 2. He feels no remorse for Brienne, is driven to fight Euron only because of jealousy.
Jaime needed to kill Cersei for his story to be complete, to kill Cersei - to save the city from (at least one if not both) Mad Queen(s) was his destiny - and instead he was smooshed accidentally by a pile of bricks - clutching a women who was probably faking a pregnancy to manipulate whichever man was the closest to her.
The Double D's seem to have become so obsessed with telling a story no one has guessed that they're willing to run characters into the ground just to shock people. They have created characters so weak and one dimensional that even during perhaps the most fantastic cinematic hour of television of all time all people could say was, what they fuck?