I'll place my two cents on Dany, in writing on a phone so excuse any typos or grammatical errors:
Personally, I really enjoyed her story, just as much as the other stories for other characters. Yes she was more badass pre season 4 but to say she had no character development is well, untrue in my opinion. She went through many woes and came across unexpected scenarios that would be baffling to anyone expecting an abolishment for something as clear cut as slavery. The slavers posed problems, that's to be expected, but the main issues came from the freed men themselves, some wanted slavery again, others thought Dany is making them the masters. Some worshipped her when all she wanted was justice, her skewed sense of justice anyway.
When she first entered mereen, she crucified masters who may have been innocent just because, she dreamed about burning cities to the ground and had absolutely no regard to any life she deemed as her enemy. She was falling into the same traps as her father and Daario did not help in that regard. He eniucraged her to burn any life, regardless of any trial, and it took sir barriston Selmy to show her the errors of her ways. this confusion and lack of confidence reflected on her dragons as well. That's why she needed to go back to the dothraki to prove that she herself is a queen even without her army, her dragons, or anyone for that matter.
So yeah, there was a lot of character development, she has had her ups and downs and learned a great deal from that. I can see why people don't like her but she has gone through a lot of shit.