Compared to Avatar: The Legend of Aang, this sequel has its own appeal: it's really energetic, featuring mostly city environments, has an older cast than the one in Aang, and just has an overall faster, flashier and more forceful pace than its predecessor. That makes it a lot of fun, and a very exciting show, but at times it also makes it hard for me to warm up to the cast, and hard to just take a moment of contemplation, peace, and relaxation like I would with The Last Airbender.
Visually, like "Aang", this show is stunning. Beautiful, intricate and unique environments, with lots of fluid and well-crafted motion. Awesome soundtrack with the series' trademark mix of eastern and western music, but "Korra's" music is more rocky and jazzy, to match with the show's tempo, than "Aang's" smooth and calm scores. The storyline seems to be picking up quite nicely as well, with civil conflict brewing up in Republic City. The show is definitely making its own path and tone, and setting itself apart from "Aang".
But I still found myself really missing "Aang's" serene environments, gentler characters, and the cute, quirky humor. In fact I kind of found it hard to warm up to the characters in "Korra"....Korra is overall a very cool character, but is too aggressive and forceful. I hope that changes throughout the show, as Avatar always shows the evolution of its characters. Her newfound city friends, as well, are not that likable and their friendship is a little distant -- Aang, Katara and Sokka's friendship was as naturally progressing, fun, and close as they get. I also really miss the silly humor! Who can forget the cabbage seller from "Aang", and Sokka's silliness. With "Korra"'s older cast and a very serious conflict and villain already introduced and confronted, I really want more humor to balance the show out.
I think the show needs to calm down a bit, take a breath, and let its characters meaningfully interact a little more before ramping up the action to the 1000th degree. Still, a flaw due to excess is better than a flaw due to lack. The Legend of Korra is an excellent and well-crafted show, and I look forward to seeing it form into a series worthy of its predecessor.