Korra keeps coming up with the strangest logic. "We saw him go to this one place in the spirit world for his secret meeting, therefore it follows that it's his only spot and he must go there all the time!" Atleast it didn't work. Still, they brought back Iroh for this again? Jeez. 4th season, he's going to be like "What, again? What do you need help with now?" BTW, brilliant advise from Zuko. "Well, Aang would consider the airbenders to be his biggest dream, but as the avatar, the world would need him, so....I don't know" And apparently this helped Korra.
It's vaguely amusing that after basically a life time of failure, Tenzin manages to actually be the better fighter against the most capable villain the show has ever seen (to the point of him being a villain sue). He still fails, of course, but atleast it's not his fault, since it turns into a 4 on 1 fight. Which, of course, runs in the family, as Kya and Bumi get their asses handed to them.
I hate that Kai keeps playing rescuer to the damselled Jinora. That trope got old the first time they did it. Why is he going on this dangerous run when Jinora is the far more experienced bender, to the point where she is atleast close to being a master? Why does she continue to do absolutely nothing?
The fight choreography are again reminiscent of TLA via use of the environment, and that's only a good thing, but with added brutality that made it pretty intense. Loved Kya's "oh, shit" face when Ming Qua did the multiarm thing.