Korra suffers mostly from inconsistent writing. When focused on the Equalist storyline, the first season is good. When it wobbles into Unnecessary Love Triangle, it suffers.

Season Two, when it focuses on family, and in the latter half, is outstanding. But the first half is marred with things like Unnecessary Love Triangle and the comedic side story with Bolin.

Season Three, so far, is alternating between Plot that makes no sense yet and a story of family and rebuilding what was lost, which is the infinitely better plot.

So I guess it depends on your tolerance for stretches of mediocre writing in between stretches of really good writing.