Now here's what I will suggest dear producers & directors of this show:
1. Change Azula, Mei & Ty Lee actors to more athletic ones and lore accurate.
2. Add less slow motion for water bending
3. Add screen shake during earthbending
4. Improve overall scripts and make them look less childish
5. Ask Katara's actor to act more and not just stand without emotions.
6. Add some parts that were important in the cartoon, for instance this live series didn't show Aang's first avatar state under the water and his waterbending, as well as Pakku's necklace and some other things which were really important for the fans.
Just fix these things and I'll give you 5 stars. PLEASE.