I hated the final episodes and pretty much the whole final season. My hatred has nothing to do with the alleged "bisexual theory" (mostly because I think it was just two girls being close and good friends to one another in a 'best friend' kind of way and I think the theory is wrong). The first three seasons of this show were straight up amazing.
Season 1 - Instead of just another crazy powerful bender (like the whole first show was based on) this one had to do with an anti-bender nemesis. Amazing and a great twist!
Season 2 - This one had to do with a crazy guy trying to fuse with the ANTI Avatar spirit. This was even more amazing than the first season.
Season 3 - A group rises up in order to take out all governments everywhere! Not quite as awesome as season 2 or 1, but still pretty awesome!
Season 4 - A crazy powerful bender lady tries to take over the world. Lame. That's what The Last Airbender was for 4 seasons and I didn't need to see that again. Not to mention there was just too much focus on machines in this season. Hated this season except for a few bright spots. So disappointed.