Halcyon100
But also because there are just way to many unanswered questions that they left behind which just frustrate people more than it makes them satisfied.
I have to admit, I was rather frustrated with the ending. Not because of the energy-bending, the turtle, or the lack of Ozai-killing (though you have raised several good points there), but because of the aforementioned unanswered questions. It's almost enough for an entire season, let alone the promised movie.
...Well, that and the ZukoxMai pairing. She's gotten brownie points since she started breaking out of that 'blah' state she's lived in, but in no way did she have enough to afford Zuko. *trails off into a grumbled rant about pairings*