Considering that it's been 5 episodes and she hasn't mastered Airbending, I don't think it would be accurate to insist that she mastered it too fast.
Originally Posted by Lavenderpaw
Plus the fact that she hasn't mastered it yet, plus her less than victorious encounter with Amon, I question if Mary Sue is an appropriate description.
I wouldn't really find it to be much of a stretch that Katara divulged details to Korra about her friends and thus why she'd be know about Lin's relation to Toph.
Anyways, the little kids are awesome and the animals are cute but I just get irritated that this interesting followup has to devolve into "bro" and plot holes with Korra knowing the brother of Aang or the sister of Suki or whatever the creators do to Mary Sue her up the totem pole.
Deadpool on the "genius" of Hollywood: Everything's turned into a movie these days. -- Old TV shows, board games, candy bars. And let me tell ya, I'm totally stoked for Butterfinger The Movie.