I was more than satisfied with the fight scenes in the last two episodes, especially watching it again.
To go to the OP, I am glad Korra didn't do anything I wanted. It is interesting; mercy and love seems to burn hotter than vengeance for bad guys/evil. Korra gave Kurvira mercy; that love and friendship she could have had (had she not been a murderous dictator) upset Kurvira more than if Korra had just decimated her. It reminds me of what Hell - from a perspective of a living and loving God would be like. Maybe it isn't literal hellfire, but the pain and burning comes from the full knowledge if what you missed out on had you chosen righteousness. Kurvira will spend a lot of time wondering "why... why did Korra spare me?" That hurts more than literal hellfire, I would think. Especially, if you get to see people having relationships with which you could have shared.
Maybe the real Hell is seeing the Light of true love and fellowship - from afar (like The Rich Man in Christ's parable.)
After having time to watch the final again, it delivered famously.
Even better; it allowed Korra to connect with a
future of happiness, love and friendship.
Doesn't matter; Korra and team Avatar made their own future.
Rethinking the finale, it was actually done very well. I was judging it based on ADULT amines I have seen, forgetting this is a Nickelodeon show. It was great in general!
And, did anyone else know David Faustino (Bud Bundy from "Married With Children) was the voice of Mako?