It's a good show, but I was really hoping for much more considering how good the last airbender was. Besides the forced angsty teenage romance, the weak antagonist development (something TLA did categorically well), new plots every season (subjective), what really bothers me the most is the lazy writing for the fights. The last airbender had such style when it came to the fights, incorporating a diverse amount of real world martial arts.
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Now, even an orphaned homeless kid figures out how to bend lightning and the final fight during harmonic convergence, it was just a mess of giant godzillas flailing their glowing energy dicks around. It's a cartoon, impressing by way of scale only really cuts it for the kids.
They're missing the flair that TLA had. Zuko vs that commander guy, Zuko and Iro doing the dragon form, Toph vs earthbenders, Sokka's sword training, I could go on and on.
It's not that Legend of Korra isn't good, and if you haven't seen TLA, by all means it's a good show. But since it's tried to connect to TLA in its timeline, you can't help but compare and that makes the whole show that much weaker. If you've seen The Dark Knight Rises you might understand where I'm coming from.