When you say the very last episode, do you mean the entire 4-part finale, or do you mean you've already seen Sozin's Comet parts 1 through 3?
Anyway, I want to hear some of your thoughts. Who were you favorite characters, favorite villains, favorite episodes, favorite scenes? Where you surprised by Zuko in the Book 2 finale? What did you think of the world-building, and how do you think the mythology holds up to other modern mythologies (is it worthy of comparison to fantasy franchises like Star Wars, LotR, Harry Potter, etc)?
Anyway, the show is really great, isn't it? The sequel series is a real set up in production value, so I highly recommend the Bluray or a good 1080p rip.