People need to understand the limitation of making this series. They have to cut some events because they can only make 8 episodes.
The acting was just slightly off. Tho I like Aang, Ozai, Azula, Zuko, Bumi, Suki, and Jet's interpretation.
Sokka was quite serious but still give one liners every other time. There's also something off with Katara, I think it's just the acting and direction.
The problem here is that there is a lot of exposition. The introduction of characters is a little bit underwhelming unlike in the series. I hope they don't do this with Toph on the next season.
Overall, the effects are great. Ofc they are limited with real life physics of the elements. In the animated series, they can do anything but it's hard to make that onscreen.