This is a great drawing. However, I have my doubts about this series. With Avatar: The Last Airbender, there's virtually no doubt that it's amazing (I even watched it some when it originally aired). With The Legend of Korra, there's a lot of doubt. Let's count the reasons I've heard.
1. Mako being a jerk for basically abandoning Asami for Korra.
2. Overeliance on Toilet Humor.
3. Lack of motivation on the part of the Equalists (e.g. lack of examples of non-bender discrimination)
4. A very rushed finale.
5. Korra's lack of character development in the first half of season two.
I mean, I know the internet ripped "Frozen" a new one before the movie even came out, but those were for easy to refute reasons. Let's take a look at those.
1. It's changing the source material - True, but when hasn't Disney done that?
2. It's not 2D hand-drawn animation - Computer animation is the new standard. I think that both Hand-Drawn and Computer-Animated Animation is great and don't like how the former is treated as completely outdated, but that's the new standard now and "Frozen" is hardly responsible for it.
3. It's basically just a ripoff of "Tangled" - Based on what? The animation style?
Those complaints were relatively easy to refute. The complaints for Korra, not so much.