Honestly, I found it rather brilliant overall as far as Korra went. Yea, a few things that bothered me, like Jenora knowing it was metallic, but I think part of that comes with having seen the first Avatar. It's the common issue of sequel series. You play it against it's bigger brother, and because you saw the bigger brother first, the little sister loses. I view Korra as it's own series which ties into The Last Airbender, and shut off all the rest. And because of this, I honestly really love the show. I still love the story of Wan and the Lion Turtles. Such an awesome way to throwback to The Last Airbender where Aang got the ability to remove bending from people by speaking TO A LION TURTLE...
And really, if you think about it, Season 3 was rather good. I liked the idea of others gaining the ability to Air Bend due to the change in the spiritual energies. It was basically a way to get away from the possibilities of Aang having recreated the ENTIRE Air Nation and EVERYONE is a descendent of him in a way, meaning less stuck-up bitches going around saying "WELL MY GREAT GRANDFATHER WAS AANG! THE AIRBENDING AVATAR" yea...Fuck that. xD As far as it goes with Zaheir, he was a good villain. He knew all about the Monks and their meditation, and knew of the whole "Enter the void" thing. This only made me enjoy it more when he finally DID fly, due to his attachment [Miss Combution] being severed. Though, yea... Su should have been able to tell the poison was metallic on her own by using the whole feet seeing thing that she inherited from Toph.
Season 4...That's where I'm slightly losing interest, but still want to see how it progresses. Earth Empire is basically the Fire Nation in a nutshell..Which kinda throws me off.