[SPOILERS thru S7] Where did the show go wrong?

I just finished watching S7. Watched S5-7 in short succession, and I've noticed a pattern in the show's writing that started as early as S5. To be clear, I have no problem with the show deviating from the books. Especially given that books 6 and 7 haven't been published yet, they really had no choice, and even if they did, some deviation would be necessary, unless they wanted to make each season 100 episodes long. I even like some of the changes. Tyrion meeting Dany early on, for example.

Such a hack fraud thing to do... I'm only familiar with Sopranos from that list, and some scenes from Breaking Bad; obviously HBO crime shows are only one valid direction to draw comparisons towards, among others. Either way, probably more concrete comparisons (between dialogue parts, or whatnot) should be in order in order for this exchange to amount to something interesting - incl. for readers and observers. That line notoriously stands out as bad; it's become a freque