Aang is the most powerful bender and THE most powerful Avatar.
He masters all the other elements within a year.
The Fortuneteller episode shows really how powerful a bender he is.
The fact that Aang doesn't fight with killing intent towards Ozai for the first part of the battle doesn't show that he is weak.
Fire Lord Ozai is (next to Iroh-then the Avatar) the strongest Firebender around.
What about the part near the start of the fight where Aang's waterbending Completely cancels out Ozai's fire attack?
I think you are putting too much emphasis on the fact that he went into the Avatar state during the second half of the battle. Aang is a more powerful bender than Ozai.
Don't let his demeanor fool you. He is just as vulnerable in the Avatar state as he is normally. Azula proved that.
Aang is the most powerful Avatar yet because he did what no one else would have. He didn't kill Ozai.







