(Spoilers for those who haven't seen the finale)
Just bumping this to the top again, since the awe-inspiring, amazingly intense and crazy finale came out yesterday!!!!
I just finished watching it last night, and let me say, spot on to the creators, they saw their vision through and finished up the story nicely. The end fight between Zuko and Azula was beautiful, Azula's transformation was disturbing, yet heart breaking, Aang's mercy to the firelord, and his final solution was perfect, almost all of the plot arcs were tied up nicely, and Aang's fight against the fire lord was just soo soo impressive, it left me speechless. It did a good job of going past the final action and tying things up nice, without pulling a JK Rowling (the whole 19 years into the future bit). This crazily deep series went out with a bang, with this spectacular conclusion! The only questions I still have are what did happen to Zuko's mother, they kind of left that in the blank, but I can see why. I just wanted her to come back and put Azula back together, I felt really sorry for her, even though she was a cold and terrible person, she was still human underneath, and she's still just a kid. I just wanted her to be healed, but It doesn't even show what happens to her afterward. That's my one small small small small small small small criticism of the ending, is that there should have been some Resolution in Azula's plot arc. Other than that small small bit, it was fantastic!
And I like how the creators played up the relationship between Katara and Zuko, that msut have had those crazy Zutara people on the forums going. I knew that Zuko would probably just go back to Mai, the creators weren't going to pull a stunt like that, the show is not about the love lives of the characters after all, some people just read way too much into things!