Watched it On Demand last night, and I'm really glad I didn't purchase it. Given the potential of the source material, there's just not much there to cheer about in the final product. It was a bit more mature (or at least it tried to be) than the average animated product, and that was interesting to see.
I've never been a huge fan of the storyline for The New Frontier (I think it's very simplistic and very random), so I may be a bit biased, but The Centre was just cheesy and poorly developed, and having Keith David give it a human voice didn't help.
The voice acting, with the exception of Jeremy Sisto's Batman and the voice actor for Superman, was mediocre at best. Lucy Lawless was ridiculously over the top as Wonder Woman, and almost every single voice actor was off the mark, pretty much soundling like they were reading their lines or simply not giving a damn about their roles. Absolutely hated David Boreanaz's nigh emotionless, very one note Hal Jordan.
The animation ranged from fantastic to terrible. The power usages were pretty inconsistent, the flights looked just terrible, and the capes looked even worse. Someone needs to explain to some of these animators that people do not always close their eyes and smile like anime characters when they cheer or applaud.
The action sequences were nothing impressive after what we've seen from previous Justice League animated projects. I was left feeling like someone dropped the ball at some point.
There were some moments I enjoyed, mostly the throwback character designs and nods to things like the JSA, and moments with Batman, Superman, Hal Jordan finding Abin Sur and Green Lantern VS The Centre, but overall, the project just felt...scattered.