I love Legend of Korra.
Of course the story, in most people's eyes, is not comparable to the original Avatar.
1. A:TLA is riding off of nostalgia, where LoK doesn't really have that option
2. LoK wasn't initially designed to go past 12 episodes. Meaning that the 12 episodes were basically the whole show at that point. Imagine if A:TLA was condensed into 12 episodes as opposed to the 60+ it received instead.
I'm not trying to diss A:TLA or anything. I loved that show, but LoK isn't even finished yet. Let's wait to compare the shows after the other actually completes its run.