If Christian Bale had been cast as Batman with Bat-nipples in the awful Batman and Robin, people would be reviling him as the worst Batman ever. It really does come down to the writing and directing.
Matt Reeves has said all the right things about the way he wants to do Batman, so I am still hopeful. He'll really need to put on a lot of muscle to be physically intimidating, and I hope he can make it work.