Men your are not alone, as a Batman Fan, I cann't believe the quantities of dead character that leave the ending. We know that and in the next sequel there is going to be a new joker (no matter what), a new gigantic menace, but we know that Batman without Joker is not a batman, even if the joker is not in the main plot, he always made is way to annoying Batman is fantastic. And how they manage to kill Thalia, what a about her legion of assassins, I understand that she want to end Jokers in behalf of his lover, and she let be capture by the Joker, but died in that way.

I hope they knew how to do damage control in what they create.