While better then the Shamalan movie (by virtue of pronouncing Aang correctly) the show seems to drop the ball in terms of it's bending and the fight choreography, the bending styles are based off of actual martial arts and while I'm no expert it seems like they replaced those techniques with general motions which are mostly just hand and arm waves (or staff waves for Aang). The show was known for it's fluid martial arts and combat scenes and I didn't get any of that from the show, the fact that an earth bender struggled to pull a wall up from the ground in the first episode was a big red flag.
I'm also a little iffy on some of the casting. While it's good that they used race appropriate actors for the roles and it was good to see a mix of ethnicities I feel like some of the actors themselves may not have been the best choice for their part.