Ah yes, another list thread. Here we go:
1. The fact that Zuko could not defeat Azula because his bending was halted by the turmoil in his life, and Azula was "perfect" with no real problems. Then, Azula ends up with the turmoil, and becomes befeated because of it, while Zuko lets go of his.
2. The whole "Zuko Season 2 Finale" thing.