Spoiler Warning - if i'm going to write spoilers, I prefer they be multiple choice!
Warner Bros. and DC can't seem to catch a break when it comes to nerd anger. Despite leaving Comic-Con with various industry sources tentatively claiming that DC "won" SDCC (which is a silly notion altogether, and wholly irrelevant - when mom and dad both give you a ton of presents, you don't sit down and tell which parent did better, you set up your Super Nintendo and shut the hell up!) another piece of news was that the DC Animated feature "The Killing Joke" was courting as much controversy as the book did when it came out back in '88.
THAT book...was dark as hell; violent, grim, bleak, nearly devoid of hope, and featured one of the Joker's more despicably violent acts - the deliberate paralysis of Barbara Gordon. And though "too dark" was a ubiquitous criticism lobbed at 'Batman v Superman' back in the spring, that wasn't the source of the nerd rage for 'The Killing Joke'.
No, it was the Brian Azzarello penned "prequel" that was added to Alan Moore's original story to flesh out the characters a bit more that got everyone all hot and bothered. Though people may flinch at the idea of amending Moore's work, additions were necessary for people who hadn't read the book, weren't familiar enough with the characters, or maybe expected their animated feature to run longer than 45 minutes.
Focusing on Batgirl, and running about 20 minutes, the prequel isn't bad, really. It has some interesting ideas behind it, and takes on a plot that vaguely mirrors the main story between Batman and the Joker - a criminal Batgirl is chasing develops an unhealthy crush on her, and Batman warns her of the dangers when a bad guy starts objectifying her (just think about Heath Ledger saying "you complete me!"). Of course, despite Batman's warnings, Batgirl continues pursuing this goon, and the hunt soon becomes far more dangerous than anticipated. I liked that Barbara seemed a little more foolhardy than cautious, despite her skill. And though it seems like a lot of people are angry about it, I like that for once someone decided to treat Batgirl like an adult and explore the sexual tension between her and Batman.
Batgirl has always been portrayed, like many other female superheroes, with a pretty healthy degree of intrinsic sexuality. Red hair, fit, buxom, smart, sassy. And chaste. And though we've seen plenty of instances of Batman having sex with Talia al-Ghul, Selina Kyle, Vicki Vale, etc, Batgirl has never been an object of his affection, or he hers (at least, in the various books and features I've seen her in) So it was nice for the writers to show that she makes her own choices, and isn't a crimefighter who doubles as a damsel in distress. In fact, not only does she protect herself well when she's in mortal danger, at one point she saves Batman's life. She's a woman who fights crime, kicks ass, makes mistakes, has feelings and has sex. And people need to get the hell over it.

As for the main story - it's nearly as good as the original graphic novel. Most of it is a direct adaptation of the book, dialogue taken verbatim, and the art style is deliberately meant to evoke Brian Bolland distinctive take on the origin (allegedly) of the Joker. In the Joker-flashback scenes, his face is animated with a softness that makes him seem sympathetic and likable. Hamill's voice changes, too, from his typical Joker cackle to something far warmer. Some things don't adapt as well (the Joker's song and dance number feels weird, but then again, maybe that's the intent) and obviously they toned down a couple things here and there (there is no nudity, of course, despite Gordon and Barbara both being stripped by Joker in the book - there are a couple of scenes that are awkwardly animated to skirt showing cartoon butts, but it's no biggie, really) but for the most part, the reprehensible actions of the Joker are presented in all their heinousness.
There's not much I really can, or even need to say about the voice acting. Ray Wise and Tara Strong bring natural style and verve to Gordon and Batgirl. And Kevin Conroy and Mark Hamill simply inhabit the voices they've been performing for more than twenty years now. Hamill is on top of his game - as good as anything from the Arkham video games, and Conroy does his usual thing with aplomb...but the final moments find a way to mix everything - the story, the animation and the voice acting into something that achieves the same sense of chilling inevitability as Moore's novel.

'Batman: The Killing Joke' is a worthy adaptation of Alan Moore's acclaimed book, and though the prequel has some flaws, and the main story doesn't cover any new ground, it's still...um...fun?...do i want to use that word?...to see an animated version of this story with the best Batman voice actors ever.
FINAL SCORE: 7.5/10
Batman: The Killing Joke is rated R, and is currently available for digital download. It will be available on Blu-ray and DVD August 2.