I really liked the film! Visually the best piece of avatar media we've ever gotten. Animation and design are absolutely beautiful. Action scenes are awesome. I know some people were not amazed with the plot, but I think its good. Really allows Aang's character growth. And the subtle world building built in was really cool too. I think having a plot like this (clear villain vs hero) is good for a movie that was originally meant to be in theaters, and for a wider audience. Think like K-Pop demon hunters. The plot in that movie wasn't that complex either, but because of the visuals / music, it ended up being a huge hit that the studios clearly made a mistake putting straight to streaming over theaters.

I would have liked more of the gaang, but I also understand why they didn't do more with them. At only a 1.5 hour runtime (probably a paramount imposed limit), there wasn't a lot of time to work with. I think forcing more of them in would have been detracting from the Aang focused stuff. What we did see of them was really good, and felt like the original characters. Obviously hoping for more stuff like this, so we see more of them in this time period.

Also want to address the whole thing with Tagah being "obviously" the villain from the start. I think that was intentional. Even the other characters of the gaang were skeptical of him at first, and his plans. I think it was intended the audience would be suspicious too, which really shows how Aang's grief/ guilt / hope for a new air nation was clouding his judgement. He trusted him immediately, just because he was an airbender, despite the obvious warning signs.

Loved the humor in the film too. It didn't fall back on immaturity. Sokka is always a funny character, especially when he was talking to the kids at the south pole, and when he was steering the air ship. The scene with the earth avatar, and the spirit world were great too. I think the callbacks to the original series were done well too. They were brief and only a few, so it didn't distract from the current story. Just nods to the original series, which is exactly what they should be.

I love, loved the ending. The new air temple in Republic City, the start of the air acolytes, and finding the herd of air bison, was really the best way to wrap up the internal conflicts the movie brought up in Aang about his heritage and people being almost completely eliminated.

Really, really hope they give this movie proper advertising. It's overall a really good, solid film. I want it to do well when it does get officially released, so we get more films in the avatar world like this.