Just saw the legend of korra finale. It was pretty good. I liked how they handled korras character growth (finally). The action was great and you could really feel the bump in the animation budget at the end.
Only thing I didn't like at all was the ending. Honestly, this wasn't a good end at all. It could have been a good or even great end for the season, but this is the end of the show as well as the entire avatar universe. It felt more like "Well, that's it, were done now", instead of a fitting goodbye to the avatar universe. I wasn't really satisfied on that note.