So, after seeing the movie.
... That's what people were getting upset about?
I mean, yeah, the movie was pretty "Meh" overall, and the whole "Killing Joke" thing is something people are pretty aware of at this stage, so, there's very little that people who know much about Batman are going to be surprised by.
So, I guess when you consider that, it makes sense they play to the whole Batman and Barbra having a fling, but, it's a pretty minor point in the storyline and doesn't really serve much in the way of Batman's motivation. If anything, he seems to not really care much. But, It's Batman, he's not supposed to be emotional. So, he isn't.
In regards to Barbra being raped and that whole thing. It's The Killing Joke. The joker is a murderer, there's nothing redeemable or above him. You're supposed to hate him, you're not supposed to say, "Oh, well, how dare he! That's real awful of him". Yeah, no shit.
So, I mean, even as somebody who's not hardcore into Batman and so on, nothing unexpected.
I was pretty surprised to see Barbra assault a guy for saying he needed space from his girlfriend. Holy shit Barbra, you're supposed to be one of the good guys.