[Answer]

1) Dany going "mad" was stupid. I'm willing to accept the fact that someone who has spent 7 seasons on the right side of the people, wanting to free them from slavery and protect the innocents can lose their grasp on sanity and decide to just mercilessly kill thousands of civilians who had nothing to do with Cersei. The problem is that there was never any logical breaking point that would cause her to do that, apart from Missandei dying - which was so long ago in the story arc that Dany couldn't possibly have that kind of knee jerk reaction. It was completely out of line with her character and they didn't write enough detail into the story to make her going "Mad" a believable angle. In order for it to make sense, it has to be a spur of the moment sense of irrationality, not a premeditated pointless conquest of an army that already gave up and an entire city of civilians who weren't even part of the fight.

2) Considering how "Mad" Dany has gotten, let's also point out the fucking 10+ times Tyrion has fucked up on levels that could've cost Dany her life. So she's "Mad" but keeps giving him chance after chance to make fuck-ups that even Jon Snow would have him executed for. There's absolutely NO way that Dany can be the "Mad" queen that the writers are trying to depict her as WITHOUT her killing Tyrion by now. Her actions towards Tyrion are completely out of sync with the villain they're trying to (and failing to) depict her as.

3) At any time she literally could've just flown directly up to the red keep and burned Cersei alive and taken over all of Kings Landing without destroying the inhabitants. The "Jaime & Cersei trapped" angle is lame, but I'd like to assume that the writers are competent enough to not make that the way they die. That being said, I've been assuming that all season and I've been wrong so far.

4) Let's point out how retarded Jaime's character development has been. I was willing to give them a benefit of a doubt and wait until this episode before I passed judgment, but here's a guy whose character developed into showing sympathy, leaving his sister because he saw her for the monster she is, shared a long and elaborate history with Brienne, stood up for her and had Brienne stand up for him, knighted her, fought alongside her to defeat the Night King's army and ALL of that is COMPLETELY inconsistent with his random, unprovoked decision to take her virginity then leave and go back to Cersei. Again, like the Dany "Mad Queen" angle, it's not that I'm not willing to accept that Jaime is and has always had a love for Cersei that would cause him to switch side and go back to her. The problem is that it completely ignores ALLLLLLL the character development that he's had over the last few seasons. If they were going to be consistent with his character, it makes no sense that he would've slept with Brienne. They could've easily left that out of the storyline and just had him decide on his own that he misses and loves Cersei, he leaves, gets captured and everything else in the storyline is still EXACTLY the same. Jaime sleeping with Brienne was literally nothing more than the writers trying to create an "oh shit" moment while completely disregarding whether or not it's something that Jaime's character would actually do in that moment.

5) Doubling down on how awful the Brienne storyline was, how about when Tormund just said "Ah damn, that guy wants to fuck my woman? ok have fun" then disappeared back with the wildlings and they never mention him again. The fuck is that shit? Again, Tormund is the millionth example of them just trying to write some shit into the storyline and showing no understanding whatsoever of who these people are, how they act, or what motivates them.

6) There's barely any reaction from Greyworm when they killed Missandei, the entire story between the two could've been executed much better. They could've had Greyworm sacrifice himself and get killed in the process, or at least spaz out and try to kill someone e.g. the mountain does the beheading, greyworm attacks the mountain and most likely dies. Who knows, there's a billion angles they could've taken that are better than doing absolutely nothing with this storyline

7) The Hound going to kill his brother under the assumption his brother was going to die anyway is kinda stupid. Telling Arya not to go in, and Arya abandoning her plan to kill Cersei was stupid. Her getting trampled was stupid, hasn't she been developing some preternatural acrobatic abilities and now she can barely navigate through a crowded city? Overall, the Hound vs Mountain scene was cool so this is one of my smaller complaints about the angles they took.

I really tried to stay optimistic up until this point, I figured they'd eventually tie shit together to a point where this stuff makes sense but they've just somehow managed to tank the entire series this season.