Zuko’s crew being the soldiers he saved is also a great change. As is getting more Gyatzo.

The biggest issue is a lot of the acting and writing. The actors for Aang and Katara just were not the best, though I’m more apt to blame showrunners that don’t know how to deal with kids, as most older actors are great. And the whole series of episodes in Omashu and then the forest/spirit world were convoluted and stupid.

The other issue is changing characters completely. Bumi going from a fun loving crazy old man trying to teach Aang important lessons is now a crazy bitter old man attacking his childhood friend. The past Avatars, rather that being loving mentors, are just useless at best, mean at worst. And with Suki no longer being a foil for Sokka’s sexism, they turned her into a horny flirt.