Imo Korra wasn’t bad it just wasn’t as re-watchable like ATLA. It got gimped because Nickelodeon is run by a bunch of morons. They only approved a single season of the show even though the writers asked for multiple to make a full story like ATLA. So they had to make the first ark self contained. Then Nick came back approving yet another single season. It wasn’t till after that they approved multiple seasons which gave us 3 and 4. Even then I think it was better than it gets credit for. No ATLA for sure but then that show is actually perfect.