He's good at what he does but I don't think he is serious enough to do justice to Dredd. Get everyone back together who filmed Urban's Dredd and you'll have the golden ticket, Charlie...lol
Personally, I think revealing the voice actors too early ruins the immersion of the game or film. Just look at Dragonheart when we heard Connery's legendary voice well before we ever saw the dragon...it was a great fit but I spent the next couple of hours seeing Connery every time the dragon was onscreen lol
