Since Bruce Timm and DC initiated the Animated Direct to DVD movies, most often based on graphic novels, they have been a mixed bag. Some being superb, some just bad. Usually the ones without Timm's name attached are the ones I have found to be the worst.
Fans of the animated Batman series have just one wish: Kevin Conroy to be the only one to voice Batman. Andrea Romano is awesome at her job. She finds the best voices for the parts, hitting home runs over 90% of the time. Even some of the others who have voiced Batman have been good. Just not Conroy. And generally, going Conway will be the right way to go. Never-the-less, this was not a horrible voiced Batman; although, his part is not large enough to really worry about.
As the modern age of comics continues to find new ways to connect heroes, this was not horrible. And, fortunately, this film, and for us, there seems to be a little continuity, in that the JL finally knows each other, and is not totally against each other.
The story is good, animation good, but, as usual, not perfect. One thing that bothers me is that parents will have to decide whether this is age appropriate for their kids, as there is a bit more use of the stronger swearing.