Just finished watching Season 3 (I was borrowing the series from a friend). My full thoughts of the series is Season 2 and Season 3 were the best seasons of the show.
I really like the characters developments throughout the entire series. I really like how the Zuko's storyline went full circle throughout the series.
I kinda wished they devloped Ty Lee and Mei a little bit, since whenever they appeared on screen they steal the show away from the other characters.
My personal favorite character of the series, Sokka. Even through he is the comic relief character of the show. He had really awesome moments in both action wise and comedy wise.
Two episodes comes in my mind where Sokka was at his best. The episodes were The Chase (which had some of Sokka's best comedy bits) and Sokka's Master (For his action bits).
Other characters that I like Iroh, Azula, Ty Lee, Mei, and Toph.
Well, here is my top 10 favorite episodes of the series, I also add which season the episode is from.
1. The Chase (Season 2)
2. Sozin Comet, Part 3 (Season 3)
3. Sokka's Master (Season 3)
4. The Storm (Season 1)
5. The Beach (Season 3)
6. The Drill (Season 2)
7. The Tales of Ba Sing Se (Season 2)
8. Zuko Alone (Season 2)
9. The Blue Spirit (Season 1)
10. The Avatar and The Firelord (Season 3)
Honorable mention for these two episodes, "The Blind Bandit" and "The Crossroads of Destiny". These two episodes were really close of being in my top ten episodes, but they got beat out by two also really good episodes.
Overall, great show. It took the show a little bit to get great and awesome. But they build it up really nicely done. I probably going to end up getting the series myself on dvd sooner or later.