Ruler? Conqueror? I’m not sure if by virtue of her birth she can be classed as a conqueror or not of Westeros but the one thing that is certain is that she didn’t actually take the north by force either way, their King willingly chose to kneel to her.
As for then wanting to take Kings Landing and the rest of the kingdoms, how is it much different than the Baratheons and Starks taking Westeros by force themselves? They didn’t exactly do so by peaceful means and it can be said that they done so for their own gain.
I won’t justify how Daenerys took places in Essos as dependent on who you are in that situation and what you lose or gain will dictate how you see her. However, I don’t think that you can make much of a distinction between ruler or conqueror and wether that makes her worse than others as in most cases, all land is taken by force at some point and she done so no differently then any other person. Westeros itself was taken from the children by the first men - ancestors of the Starks no less - hence the need for them to create the white walkers in the first place.
Apart from Kings Landing, she also didn’t ‘destroy’ anywhere, at least no more so than any other typical battle would. As for Kings Landing she never had any plans to burn it all down, she said so herself once she arrived that she did not want to be queen of the ashes. Which is why her doing so doesn’t make much sense when people are justifying it by saying her actions throughout the show foreshadowed this outcome. Even her burning the Tarleys didn’t foreshadow it. Morally ambiguous? Sure. But no more so then Sansa killing Ramsey by having him eaten alive by the hounds or many other killings in this show.
Bran has been shown to directly intervene in the events of the show more than once - saving Jon, Hodor, the knife, knowledge of Jon’s birth - so no I don’t believe he couldn’t of intervened in Kings Landing if he wished to. As for him not doing so for ‘the greater good’, sure but then how is he any better of a ruler if so? He isn’t.
On to Westeros not being Daenerys home, where was if not there? She was born in Dragonstone and her home was taken from her by the Baratheons and Starks. She was a child, innocent and with no means to take it back until she was older, much younger then any of the Starks were when their home was lost. Her family had lived there for generations. If that’s not the definition of home then I don’t know what is.
My point is that no character is ‘good’ in this show and if I’m not mistaken, that’s actually what George Martin himself has wanted to portray. All the characters have made questionable choices in the want to survive and thrive and in the name of revenge and justice. As for the ending, I was actually expecting Daenerys to die and Sansa to become queen, I just think it was all done so rather disappointingly. They changed the characters traits to fit their timeline, plot holes that didn’t make much sense, had many subplots for lack of better term not amount to much, took out the creative twists and made it where the ‘good’ guys won and the ‘bad’ guys lost which is not what Game of Thrones was so popular for.
However that’s just my opinion, it’s interesting to see how different others view it all.