While they've got the kind of actors i would've expected for the other heroes, of coruse Hammer and Cotrona don't strike Batman and Superman to me too. But that dosn't mean they have to be bad. Now, i wouldn't mind if they'd recast them, but if they stay, i've also got not problem with giving them a chance to show me what Miller and co. saw in them. After all, characters like Batman and Superman are only around for such a long period of time cause they were redivined over and over again and there were always people who added new edges to that characters. So why shouldn't they be one of these people? Cause other people don't think they are? Well, that would be step one!
Bottom line, i think people are just overreacting here, cause these two guys don't fit in their close-minded idea of the characters. You can turn that whole height/age argumentation around and say, in his early adventures, Superman was physically portrayed as an average joe, while, according to Batman writer Grant Morrison, the current version of the character is suppost to be arround since he was 19 or 20 years old, so even if Hammer would play his age, which i don't think he will, since he looks at least 25, he could still be around like two or three years. But i don't think all that stuff makes much sense and i don't think a few inches of height or a few years of age more or less are the important to make these characters convincing. The roles are filled with unknowns, which i think is the right way to go for these heroes, and we just have to wait and see if they will be able to play them convincing actingwise, which is the thing that matters the most to me. They could turn out to be terrible choices, but they could also turn out to be great, so fanboys would have to eat their words up just like they had to with Michael Keaton or Daniel Craig, to name a more recant example. (and yeah, i know that they had more acting experience than Hammer and Cotrona, but my point is that there are plenty of actors of whom was said, they wouldn't fit the roles they got casted for and jet, they did) If this movie really gets made and if Cotrona and Hammer stay, i'm almost certain that they will get their supporters after the film is out anyway....