The movie was fun, a bit short like many animated Batman features, and lacked complexity of some of the other films. It definitely was not on par in terms of style, content, complexity or overall artistry with The Dark Knight Returns, Doom, JL: Crisis on Two Earths, or the Green Lantern Animated Series.
I agree with many other reviewers that the voice actor was the wrong choice for Batman and that the iconic Kevin Conroy voice is the best. This voice actor's voice has an Adam Westish goofy twinge, old man warble to it. I'm not saying it's a bad voice, just not the correct choice for the dark knight Batman.
Regarding the story, I didn't like the backstory that Batman was a rohypnol victim who was sort of date raped. That was stupid. Also, what is the motivation of Talia to 'rebuild the empire'. Where does she get the money to do it if her 3 fortresses are destroyed and their mining operations also? Does she offer a ninja assassin work study program / unpaid internship program or does she simply rohypnol them as well? And if they are working for free, do they also build their own beds and farm their own vegan buffet offerings? I think she'd have been better off marrying Bruce Wayne and then withholding sex until Batman buys her an army. Sorry if that sounds like I'm saying something bad about women, I'm not: keep in mind she's a woman without scruples anyway, but as Batman is a flawed hero (driven by vengeance he can never quench because he blames the city for producing criminal elements that killed his parents), maybe it would work as a story. As participants in a constantly-mutating, modern living myth, I think Batman fans can handle complexity of a Batman with controversial and questionable living arrangements, especially given we love the Dark Knight and his flaws.