I am so, SO proud to be an Avatar fan right now. That finale was the finale to beat all finales. It was amazing. Here's my little review:

1st episode, The Phoenix King:

Zuko/Aang battle very cool
Aang disappearing and everyone trying to find him very very cool
Going to see June, she's awesome.

2nd episode, The Old Masters:

Aang and Momo on the island talkin to the Avatars was awesome. The animation was super good here, one point so good it reminded me of Spirited Away when Aang was walking under a tree.
WHITE LOTUS IROH PAKKU BUMI JEONG-JEONG PIANDO AWESOMENESSSSSSSSSS
Zuko and Iroh scene was a tearjerker
June was here again, very good. Liked Zuko's comment about how he hired her to track the Gaang. "Yep, back in the good ol' days." Also liked that she said Aang didn't exist. That was really awesome to me.
"Hmm... Grampakku!" - Sokka
"Hmm... someone important is missing from your group... where's Momo?!?" - Bumi
"I knew I shouldn't have asked Kyoshi." - Aang

3rd episode, Into the Inferno:

Zuko/Azula/Katara battle was soo intense, my heartrate like doubled, no lie. I was really scared Zuko was gonna die with all that sad music and all.
Sokka/Toph/Suki "excursion" was also intense, I was also worried a lot for Sokka at one point.

4th and final episode, Avatar Aang:

Aang/Ozai battle very good, loved the way he was bending all four elements.
Umm.... Fire Lord Zuko ftw
The Zuko and Aang scene where they were in front of everyone reminded me A LOT of the Avatar and the Firelord.
Everyone together at Iroh's tea shop was sweet, Kataang was even sweeter.
I loved the way they had the chinese version of the end and then actually said the end, actually cried there.

Other things that I loved:

The music. The music was absolutlely SPECTACULAR. Esp. the "Previously on Avatar" music, the Aang and Momo on the island music, and the Zuko/Azula/Katara battle music. It really added to the show.
The animation; also spectacular.
The Blue Fire Throne Room. Very good animation here and also it was just supercool. Azula looked pretty hot
The way they included the Lion Turtle, I loved that. I've been wanting to see it ever since we saw it in a book at The Library.

All in all, Avatar was great and I will miss it a lot. 10/10.

That's it for tonight,
Josh