Full spoilers follow for Avatar: The Last Airbender.
How many TV shows can you name off the top of your head that had an ending that met your expectations or appreciation of what came before? More often than not, we run into a series that overstays its welcome. Perhaps its story gets stretched to absurdity to meet the demand for more seasons (see Lost). Maybe its characters, perpetually upping the ante in shenanigans or drama, stray from their story arcs, becoming exaggerated parodies of their formerly endearing selves (think Andy in The Office, or Andrea in The Walking Dead). And sometimes shows pull a Dexter, and… well, we all remember Dexter.
It’s why shows like Breaking Bad and Game of Thrones are looked upon so fondly — not just because of their tight, condensed, expertly paced stories, but because their characters have consistent goals or motivations from the first episode of the show to the very last. These were shows where the creators were given the freedom to tell the story they wanted to share, but with an often underappreciated liberty in that they could do so in however many episodes they felt were needed.
Source: IGN.com Avatar: The Last Airbender Ended 10 Years Ago and It Was Perfect