I kinda disagree. I mean shyt had gone so well for her and she had staked so much and gained so much respect that she became entitled and arrogant and didnt know how to handle not being respected and having her two dragons and best friend killed. I think the show is just tryna say humanity aint and anyone can be corrupted
None of that was handled well though.
She has been disrespected a million times before. She also had a pretty extended chunk of time between her dragon and Missandei being killed and the moment when she was sitting on top of that building in King's Landing seeing that she just easily scored the W but decideing to just say "fukk it" and burn everything down.
The moment when Dany decided to burn it all down came across as unearned because it made zero sense. What was the inciting incident that made her decide to murder an entire city in that moment? She had easily won the weak ass battle. Cersei had given up. The soldiers had surrendered and the people were cowering at her feet. So what in that instant tipped her over the edge? Because it wasn't shown to us.
Dany could have just as easily flown up to the Red Keep and burned it to the ground with Cersei in it instead of indiscriminately killing all the white trash of KL. That would have been seen as "mad" by the standards of this show and that would have made sense within the confines of what we had seen on the screen up to that point.
That bowl cut having bytch killed Dany's dragon and her best friend so Dany deciding that Cersei doesn't get to surrender would have been a believable moment (that satisfied viewers since it would have been a more fitting end for Cersei than what we got) and would have still allowed the show to do the "Mad Queen" story. Tyrion would turn on her. Jon would turn on her. Jaime would want her dead. Everyone would be justifiably angry that she ignored the ringing of the bells and she would have to explain her behavior. But now we have an artificial villain in Dany set up to do battle with Jon Snow and the rest of The Starks and the whole thing just feels hollow.