Yours and Marcc's devotion to Korra does make me want to see what you guys like about it.
The fight scenes as much as anything else, save for maybe the nostalgic homages to the original series. While the main plot was as good as A:TLA, the subplots felt a little rushed/forced and we didn't get anywhere near the character development as the original toon. That said it's still better than a lot of the action toons.
Here's a taste of the animation, though the kid played with the speed at times. http://www.youtube.com/watch?v=oygcJWmZbtg#t=2m00s
The pacing is utter shit and the shipping was excruciatingly cringe worthy. Other than that, it was a great season.
I loved the ending. Kinda pissed the Koh the Face Stealer theory was wrong, because it would have been awesome.
Also the murder-suicide was probably one of the best single moments of both series so far. Right up there with the lionturtle/energybending and the episode "Tales from Ba Sing Se". I must say that "Tales from Ba Sing Se" the best episode of animation I have ever watched.