Mike and Brian have created an amazing new age in the Avatar world. An industrial revolution is in full swing and the old clashes with the new, bringing a new conflict to the fore; benders vs nonbenders. So I love the new premise and the issues that are being brought forth. What I don't love is how fast the pacing is. My biggest complaint is that Korra is told she's the Avatar when she's about four years old. Moreso, that she can competently bend three elements at that age.
However, I am enjoying the story being told, so I will continue to tune in.