I thought both the voice acting and the animation let it down. Peter Weller sounds like an ideal choice for an old Batman with his monotone timbre. But it wasn't too long before it came off to me that he wasn't putting forth any enjoyment or personality with the role. The breaking point for me was when he says the line "THESE MEN ARE MINE!" as "These men. are.mine." with no zeal or feeling. You read TDKR, Batman has oodles of personality. This honestly felt like Robocop in a situation where it's completely unjustified. The same goes for the rest of the cast, although Carrie's voice actor wasn't bad in that her voice fit Carrie well I thought. She sounded like the only character in the movie awake.
The animation had nice models, but again this is Frank Miller. TNBA showed us how easy it can be to translate Miller's style into animation, why did they try and naturallyrender characters like the Mayor and the Mutant Leader? Plus, certain scenes were re-interpreted in ways that I thought missed the point. In the book, it's a big oment when we SEE Batman for the first time in that splash page. We see his hands and feet, but we're not given the moment until the tensionleading up to it breaks. In the movie, you see in full view what he does to the pimp and the Mutants, and it's no any better or more interesting. It's not about the literal action as it is the fact that he's a force of nature barely comprehendable to the people he's saving.
I dunno what the hell happened. Again, it's my opinion and from the looks of it an unpopular opinion, but I felt that this was the biggest missed opprutunity the DC DTV movies have ever made. I will say that the music was very good, most of the violence was intact (save for the Mutant Leader beating on Btman with a crowbar, that was neutered) and the decision to make it into 2 movies is a good one. But after seeing the amount of effort put into this, I don't have high hopes. I hate saying that, I did not go into it looking to say it was bad.