Going in, I was bitterly hostile toward the fact that they didn't use Kevin Conroy and Mark Hamill (and I would have liked David Warner to reprise his role as Ra's al Ghul, but wouldn't have been as annoyed with someone else taking it on). However, in this instance, it didn't prevent me from enjoying the movie and I thought it was really good. Probably the best of the bunch so far, in my opinion, followed by First Flight and Crisis on Two Earths. I absolutely loathed New Frontier.
I echo the sentiment that Marvel should really be putting forth the same effort to release high-quality animated features, preferably with their major names but even with those lesser known/underappreciated characters they may never make live-action movies with.