@natashalrosa - Agreed. I really liked it quite a bit and I liked that they went for a more mature storyline in every season considering that the fans of the original series are mostly older now anyways. They tackled some pretty interesting themes in regards to the world they created. I think, too many people expected it to be like the first series and they ended up pre-judging the series before it really got anywhere. I like Korra a lot more than Aang and I wish the creators were given proper support to flesh everything out a little more.
@Venom - No, Korra and Mako was out of nowhere. Korra and Asami was very subtly built up over the last 2 seasons. If you're not watching carefully, it'll pass right over your head (which it apparently did to you). I almost missed it and I was watching it after the show ended knowing full well the two get together and the subtle cues practically blew over my head anyways.