I didn't know it was a series until 5 minutes before the movie started and my friend mentioned it was based on a comic book. It looked more like a movie you'd see on the 'Sy-Fy' channel.
Spoiler Alert
Did Azula even make an appearance?
Yup. That was another problem. First they had the Prince and his uncle so you think those are the main bad guys and they'll be developed. Then comes along the general (Aasif Mandvi from the Daily Show) and his only bad attribute is embarrassing and humiliating people in public. Then without much introduction the king (Don't remember if he was refereed to as the king or not) is seen for 30 seconds, setting up the rivalry between the prince against the general and his troops, which we already knew by this time.
The evil princess was introduced through a flashback but why the king favors her over her brother is not explained and then she's seen 10 seconds before the movie ends. If she's that bad ass why wasn't she involved in catching the fartbender? To top it all off the end battle was a joke. The water people talked about blowing out the torches so the fire people had limited resources but they never did. Plus there was that classic 'Hey we know there's a huge war party coming to get us. Holy shit! A war party right outside our door!' and sure enough there's a shitload of ships anchored in the bay a hundred yards out. Did they have any scouts looking?
Oh and then there was this shot of the wall of the water peoples city with guards posted on it ready to attack the incoming siege. I won't say anything more about it but it made everybody in the theater laugh out loud.
I know I'm knit picking and I could on on and on but it was blooper after blooper and seriously degraded the quality of the message of the movie.