Yes, I have, but I'm saying his Batman voice. I'm not trying to bag on the guy, but his acting was much better than his Batman voice. In the Dark Knight, it felt extremely forced and unnatural.
Yeah, his Batman voice is in the film at one point (the nightmare sequence where Sophie sees a completely transformed monster-bird!Howl that leaves) and again, it worked just fine. And his Batman voice worked great in Batman Begins too.
I'm not saying that I want Bale to voice Batman in The Dark Knight Returns, as he is too youthful to voice a 55 year old Batman, but his Batman voice did translate just fine into an animated film in the past.