I loved Book 2. One of the best seasons of any show I've ever watched, but Book 3... has serious issues and I rank it as the lowest of the three Avatar seasons. After the end of Book 2, it was time to embrace fully serialized storytelling but instead... we got a bunch of filler.
The first half of Book 3 basically consists of the Gang having a bunch of filler episodes in the Fire Nation. The idea was sound, show the Fire Nation was not necessarily their enemies, but way too much time is spent on this while we're just waiting for the Black Sun Invasion meanwhile Zuko's existential crisis is being dragged out much longer than it needed to be at this point, we knew he was going to turn to Aang's side, it was time for it to finally happen.
The problem. The day of the Black Sun is the middle of the season. So that means very little time is spent with Zuko actually becoming a part of the gang. The Day of Black Sun should've been moved up a few episodes. The finale also has a lot of stories going on, maybe too much. Ozai's plan to destroy the Earth Kingdom was so obviously a late addition and they admitted as such on the commentary. Also, Azula should've been defeated by Zuko and Katara working together in my opinion. Azula was more Zuko's fight than Katara's.
But that's just me.
The first half of Book 3 basically consists of the Gang having a bunch of filler episodes in the Fire Nation. The idea was sound, show the Fire Nation was not necessarily their enemies, but way too much time is spent on this while we're just waiting for the Black Sun Invasion meanwhile Zuko's existential crisis is being dragged out much longer than it needed to be at this point, we knew he was going to turn to Aang's side, it was time for it to finally happen.
The problem. The day of the Black Sun is the middle of the season. So that means very little time is spent with Zuko actually becoming a part of the gang. The Day of Black Sun should've been moved up a few episodes. The finale also has a lot of stories going on, maybe too much. Ozai's plan to destroy the Earth Kingdom was so obviously a late addition and they admitted as such on the commentary. Also, Azula should've been defeated by Zuko and Katara working together in my opinion. Azula was more Zuko's fight than Katara's.
But that's just me.