Top of my head:
Lack of female relationships
Love triangle bullshit
Korra gets the short end of the stick when this show should be about her journey
the Krew doesn’t feel like a crew at all, I don’t even know why they stick together
scratch that, romantic anything in this show was badly handled
Everything about the twins except the 5 seconds of them giving a shit about each other
Where are all the mothers????
Bolin and Mako’s non-existant relationship. I thought they were supposed to be super close???
Tonraq should have been a normal guy, the fuck happened to his character???
the fuck happened with Lin’s character
why do the writers have against Asami
where the fuck is Katara, why is she such a non entity in this show???
Unalaq was a terrible villain
Tenzin and his siblings deserved better
why is everybody in love with this guy
Avatar Juan’s segment was more interesting than the whole rest of this season.
Though I don’t get how, after having seen that flashback, Korra thought it’d be a great idea to merge the human and spirit worlds?!
Oh right it was Unalaq’s idea AND FOR SOME REASON SHE REALLY LIKES TO DO EVERYTHING THAT EVIL WATERBENDER POLITICIANS TELL HER TO DO.