How to ruin a fanbase:

1. Create a TV show with a lot of foreshadowing, then put out a finale which ignores all of it and goes a totally different direction with no explanation
2. Leave a bunch of holes in the plot
3. Have an eight month hiatus between episodes then run all remaining shows and finale in six days.
4. Release the details of the finale three months before airing in a book written for 10 year olds
5. Introduce characters, spend time developing them, make them vanish, and never say what happens to them.
6. Insult your fans in an interview

Great job Viacom, Nickelodeon, Michael Dante DiMartino, and Bryan Konietzko