Well I say Book 3 Fire the second half is my favorite group of episodes of Avatar: The Last Airbender, but as a whole Book 2 Earth is the best season. The first half of Book 3 was just so fillerish and wasted prudental, that being said they had some great episodes like "The Avatar And The Fire Lord". I thought they could have done more with the Team Avatar being undercover and learning more about the Fire Nation. I thought in Book 2, Zuko and Iroh hiding in the Earth Kingdom and Zuko experience development was done much better in comparison to Team Avatar in the first half of Book 3.
They could have played more on the whole Sokka and Katara bitter feelings about the Fire Nation as a whole and learning that they are good people and bad people in the Fire Nation, just like any other place. And they could have set up Aang' internal conflict in the finale, with having an episode in which they are taking in by a nice FN family, similar to Zuko plot in "Cave Of Two Lovers", and the present days plot of "Zuko Alone", and they find out a member of that family was a FN soulder that was killed by kodzilla in the North Pole.
Anyway I was trying to make a comparisson with the strain mother / daughter relationship with Azula and Ultear. And it is similar in a way, granted Ursa is still alive and Ur is dead, but still they both thought their mother didn't love them and that led them to a life of darkness. Heck you can even the roles in Azula's mind that Zuko played being mommy's favorite to Gray and Lyon whe Ultear escaped from the lad and saw Ur with Gray and Lyon. The difference is Ursa is still alive, and Ur is dead, though somehow Ur was able to express her true feelings even though she was dead, and Ultear knew she was doing evil stuff, she falsely thought she would get a re set with Zeref's help, Azula on the other hand she didn't know she was evil.
But the more I think about, while her relationship with her mother might be like Ultear, her relationship with her father is almost exactly like Minerva. Ozai and Jemma they have the mind set of being greedy power hungry egotestial guys, and raised their daughters to think power and strengh is all that matters, and love and friendship is a weakness.
Azula she is a combo in her upbringing in two of Fairy Tail's more twisted messed up evilest villainess in the series.