It's an awesome film, no doubt. I've never had a problem with Bale's voice, though. It seems logical he'd change it so no one could make the Bruce Wayne connection.
It's logical, but it sounds goofy. I notice it a lot more upon repeat viewings.
I've decided I don't like the film anywhere near as much as I did the first time I saw it. I have a hard time sympathizing with any of the characters, and that makes it really hard to care about their fates.