]when Dany isn't saying some edgy trailer line, her magical dragons and expert advisers are ROFLstomping any and all opposition, the other half the time people bow down and worship her on the spot as their messiah. I have seldom seen her take active steps to better the people she claims to rule over. (I don't think she's a mary sue, since that would imply she actually did something). She had a very intriguing character premise, and it was squandered.
Stannis had a genuinely interesting character idea of being the reluctant ruler who fought on out of obligation, and was on the road to becoming the best of the possible rulers when he prioritized the zombie threat in the north... only to squander that by burning people at the stake after buying into a witch's prophecy. Then he was killed off just because.
Robb could have had an intriguing character story about trying to be as righteous as possible in a harsher than normal reality, but I genuinely believed he screwed over for anvillicous reasons.
Bran becoming a wizard who will play apart in the Northern war? His character has been made into an idiot, barely characterized, and his companions were so disposable that one was reduced to an exposition device, another as a meme character, and the third has so little development she mind as well be an after thought. The idea of him struggling to come to terms that he would never be the knight he wanted to be was completely glossed over.
Littlefinger was changed from a genuinely mysterious chessmaster to a one-trick mustache large ham. I do like him; he could've been so, so much more.
Varys is just there to be philosophical and pull plot conveniences out of his back.
Arya's just a serial murderer; I'm surprised the fandom glorifies her as much as they do.
Davos, Jorah, Jon, Bran, Brienne, Tommen, are the only actual people in this tale I care about. Notice how only ONE of them is a main. That says alot about my opinion on how the show handled it's dozens and dozens of characters.