I can't praise LoK enough. I was wrong about pretty much everything I thought would happen, and I find I am so very happy about it. I thought the whole finale balanced out really well with AtLA. And the piece de resistance was of course, the last 2 minutes.
I wasn't on the Korrasami ship until season 3. (Being perfectly honest, I probably didn't even clue into the ship until then.) But I was always on the "not Mako" ship. Right from the start. No particular beef against that character - the chemistry just didn't click for me. Ever. Hell, at first I was happier to see Mako with Asami, just to have him not with Korra. (But as season went on, that changed too. Mako needed to grow up almost as much as Bolin did, just in a different tone.) But Korra and Asami....worked. I could see it in the mind's eye and it had made more sense than other choices.
The ending worked wonderfully. Yes, I was one of those people chanting "kiss! kiss! kiss!" during it, even though we all knew that they couldn't. (Let's face it, with all that Nickelodeon put Korra through, its amazing that they didn't end scene after their heart-to-heart on the stairs, which was I was expecting. It was a nice scene, but the part after was what cemented things.) The show it ended on a note of love and hope for the future (just like AtLA) and dear God, I hope LoK continues that trend and churns out some comics. They'd hopefully have a little more freedom, and we could get more and more closure to the characters and series. And make sure they all get the happy endings they deserve.