Korra was a violent thug. Entitled and sure in her superiority. Like any rich girl tomboy, tbh. She's honestly kinda grating. And that's even before getting into her doing things like forcing herself of Mako after leading Bolin along.
Then there's the fact that at, like five, she can bend three elements. Aang was considered an incredible genius for becoming an Airbending master at 12. Further, Aang had 0 idea that he was the Avatar until later. But Korra Sue can bend multiple and for sure knows that she's the Avatar at an incredibly young age.
She's really hard to like.
And the transition from Aang to Korra really destroys a lot of the spirituality of the setting turning it from 'anyone can be a bender' to a setting where the practice of eugenics makes complete and total sense since bending is accessible through genetics, even if it takes training to actualyl master. Lightning Bending was a Fire Lord Family Secret and like seventy years later, there are minimum wage lightning benders.
Korrasami is a joke. Asami isn't even a real character until like a third of the way through season two. And in order to 'explain' the ship you need pages and pages of the weakest arguments to 'prove it.' The comic follow ups about being gay are also a joke.
Legend of Korra was not a good show.
But she was a GAY WOMAN OF COLOR and so she is precious and can do no wrong! Gollum!