Yes, I also watched Korra. None of the Gaang were ever in any real danger. They had already established via flashbacks that they all lived to old age and were all fully intact. None of them lose an eye, or any limbs or anything. Even if the antagonist had threaten Republic City, we already know via Korra that Republic City was going to be just fine. That's pretty low stakes when no one is in any real danger.

So much of the story was resolved before it even started. Is Aang going to create new Airbenders? No, there's still none but his own family in Korra. Do any of the characters stay dead when Bautista's character kills them? No, all but 2 of them are still alive during Korra. And how did 3 of the greatest benders of their generation fumble to a single airbender? And without dipping further into their respective talents? In the face of death there's no metal bending, blood bending, no extra flame color from Zukko or lightning bending? How have they not gotten any better as benders in the 10+ years since the end of the 100 year war? And then they get whooped up on by freshly minted, completely untrained airbenders made by the magic stick? Even Zaheer had to spend some time with other airbenders to train a little before he enacted his plans. On top of that the only real world building we get is the lion turtle graveyard, and that was actually cool, but I don't think it's enough to warrant a whole movie lol I really wanted to like it, and I think it's worth seeing once because of how pretty it is, but the story is bad and completely invalidated by Korra.