For the most part I only started watching this because I wanted to see what the final outcome would be of the original series. But after watching the first season I was completely hooked and wanted more. The animation was absolutely stunning and the voices fit their characters extremely well. My only complaint is that the entire season felt rushed. Though it is understandable as it was originally only supposed to be a mini-series of twelve episodes. My only other complaint is that throughout the entire season they don't properly show how powerful Kora really is. While in the original series they showed is with Ang using the avatar state which I always enjoyed as I thought it was quite cool.
Overall definitely worth watching but it doesn't quite match up to the original series.