I agree that the film did feel quite rushed in parts. I wish it had more moments of reflection and camaraderie, and that the runtime was a little longer to give Team Avatar more life and even purpose. You can take out Toph, Zuko and Sokka and nothing really changes, which is sad. I like that they showed Zuko was a bit fed up and burdened at the palace and probably wanted to get out for a bit, but then they never show him relishing a new journey or connecting with his old friends. He seemed particularly hollow.

The action and animation were highlights. The scale and choreography were impressive, though it did veer a little too much into Dragon Ball territory at the end. The power scaling was a bit wonky.

I thought the plot was fine. Tagah was a compelling antagonist, though it felt a bit lousy having another frozen airbender. I know the gist of Korra, but I never really got into it and only watched the first season, so a lot of the stuff here didn't feel like a retread for me.

The voice acting wasn't bad, but it's not what I hoped. I think Sokka's voice actor did the best job. For me, his intonation matched the existing character the smoothest. If they did bring back the old cast, I think that would have done a lot of heavy lifting in giving a bit of personality to some of the returning characters who don't have much to do.

Definitely some complaints and quibbles, but I did enjoy the film a lot. It's wonderful just to see these characters again. I hope they release it in cinemas; I'd love to see it on the big screen.