The show's treatment of Dany is pretty awful. She goes from self-sacrificing hero to power-mad villain in two episodes.
And what's worse is that it's all on her. She is completely to blame for murdering hundreds of thousands of civilians for no reason. She has literally gone mad and that's why she did it.
In the books, like most characters, she's neither good nor evil. Like most characters, she's trapped by the situation. It is the situation that is bad, and GRRM is very good at showing that there is no fairy princess or hero-with-a-magic-sword to make it right. Should she have crucified some of the masters? Should she have let them live? Should she have burn the masters pyramids to the ground? There is no clear right answer.
I strongly suspect that there will be reason behind her 'mad' decision to burn KL in the books. It will be shown as a bad and terrible act, but I expect we'll see very different interpretations from Dany, Jon, Sansa and Arienne chapters.
GRRM is telling a story about how war is bad and the feudal system is bad, and how they force even the most noble and good people into doing evil. Remember, he's a conscientious objector and he brings these politics into his work. The books have a lot of rape and powerless women because he's trying to show the evils of a feudal system where women are little more than chattel and have to make terrible sacrifices to gain any power or respect.
D&D have taken a much more traditional heroic hollywood approach, with characters dong things that are generally portrayed as either unambiguously good or unambiguously bad. There's rape in the show because some people are evil and everything would be okay if only the "right" people were in power instead of the "wrong" people.
