Back to the Daenerys, I think it was completely intentional. She reject ser Barristan words of wisdom and he gives her this scared look, like he was afraid that she follow in her father footsteps. Then she cruci... signify the masters, while ominous music is playing. It's not supposed to look heroic or badass, it just show us that she's becoming more self righteous and pride thanks to the people treating her like a goddess and a savior. She really believes that she's bringing justice to this lands and can't be wrong at anything. In other words, she's really see everything in black and white, which ultimately may lead to her doom.
Yup, felt the same. Personally the "justice with injustice" line isn't something that I found bad or terrible acting on Clarke's side, but it's something that I expected Dany to say which shows how emotionally stubborn and ignorant she really is. Even in the books I was shaking my head with how she acted and said while in Meereen, and as you stated with her being seen as a savior to the slaves has really gotten to her head and is portrayed quite well.
Still, Dany and the events that take place on her side is the least interesting thing that I am interested in, and her being an obvious fan favorite is getting annoying since the show writers seem to insist to include her in almost every episode.