**WARNING, SPOILERS FOR AVATAR THE LAST AIRBENDER HERE**
Avatar: The last Airbender, the show ended well, they only had two loose ends, what happened to Jet and what happened to Zuko's mother, it wasn't a cop out ending that honestly, with nickelodeon breathing down their backs about how to end it without killing the firelord(becuase it was still a kids show, even if it did have some mature decisons), they wraped it up pretty well in my opinion. It's the best ending to a show that I've seen. Of course I don't count show like Firefly who were ended becuase of the Network, not through the show's own ending.