I’m starting to realize now that I loved the idea of Legend of Korra, but strongly disliked the show itself. The characters by themselves, the bender vs. non bender conflict, a journey in finding oneself, all of them were totally amazing ideas on paper. Unfortunately, the way it was executed left me pretty frustrated and disappointed.
It just goes to show that a good story concept never means a good story. Stories such as Twilight and Glee had ideas, but were executed in such a poor fashion that they became infamous. The Legend of Korra is no different since it had a beautifully constructed world with a conflict that did not rely on black and white conflict. It even had a tough, female, brown protagonist to boot. Unfortunately, because the focus of the story was lost and the central conflict(s) fell apart, the story fell short.
Compare this to AtLA which relied on an old-as-dust concept of a group of superhuman kids banding together to save the world. While, in its simplest form, the show is overdone, in its entirety it is a moving tale that tells the stories of kids who are bearing the weight of a hundred-year war on their shoulders.
In the end, the concept is not what matters. Without a proper execution, the story is only revered for its potential.