It was pretty good! I love the League of Extraordinary Old Men (OWL)! Rocket!Jeong Jeong! GranPakku! Bumi's delightful eccentricity! Piandao's affable bad ass-ness! Iroh's...well, Iroh just rules!
I had some logic concerns about certain aspects (Roku specifically told Aang he HAD to defeat the Fire Lord before the comet arrives, so Aang's not gonna listen to his past life now?). Although I loved the beach party at the beginning, I was surprised Mr. Plan Guy Sokka was the one suggesting it. The Lion-Turtle was weird since it felt like it came out of nowhere, despite being in a picture in the Library. It's very old school mythology and all, but I would've liked more of a build up to it. I still don't know how I feel about the comet enhanced firebenders. Sometimes it made the action harder to follow because the camera was focused on the HUGE FIRE and not the awesome martial arts that the show's known for. I also don't know how I feel about how Aang unlocked the Avatar State. Really, all it took was an accidental slam in the pressure point? Katara knew a lot of energy was backed up in that spot and yet just was gonna let it be and never try again to fix it? That said, holy crap the hamster wheel of elements looked cool!
Don't get me wrong, I loved a lot of it. Iron Man/Melon Lord Toph, the terrific trio of her, Sokka and Suki, Sukka (the only canon pairing I really have any feeling about), Toph's "life changing" field trip with Zuko, Zuko's fight with Aang at the beginning (awesome acrobatics!), Sokka's Birthday Plan and the Fire Nation men that fell for it (hilarious!) and more!
Azula's unraveling was pretty well done. She's always been crazy, but losing Mai and Ty Lee and then having her father leave caused her to start reevaluating how she managed her life until that point. The Ursa hallucination seemed a bit like her conscience or at least softer side manifesting to challenge that fear was not the reliable way of keeping allies. At that point all she had left was the power of being Fire Lord, as she had sent away everyone before they could betray her. I liked that her fight with Zuko was a very somber affair, and you do end up pitying her (especially after her defeat, seeing her cry and shriek is a bit hard to watch). The only thing that disappointed me is that I wish Zuko had outright beaten her a bit more. He got maybe one hit in, and was going to win, but I've always wanted him to get the last strike in. Not to say that Katara wasn't killer in the fight. Pretty clever stuff there and overall the fight was pretty cool. I <3 CrAzula.
I still think Aang is underestimating Ozai. Taking away Ozai's bending is a crippling blow to the core of his personality, but it is something he could get over. The show has gone to great lengths to get the point across that it doesn't matter whether your a bender or not, but how much skill and training you've had. What's to say Ozai doesn't spend time recovering in prison and then later on decides he still should rule the world? No firebending, sure, but the Kung Fu itself is still deadly. This is a hypothetical, but he is still a threat. Treating him as nothing once his bending is taken away diminishes the awesome "Normal" folk like Sokka, Suki and Piandao.
When all is said and done, for the humor and action, I really did enjoy the finale. I will miss you Avatar, especially you Sokka, Toph , Zuko and Iroh.