I think I'm getting you: Basically, with the limited range a role like BATMAN requires, you don't think Affleck can handle even that.
I completely disagree and think you're selling Affleck shorter than an amputated flea. And I'm confused as to how you can see the movies you said you've seen and are still unsure that he has the chops to manage going from "shithead playboy" to "grunting ape in a leather daddy costume."
I mean, I know Batman is a super-popular character, but he's not the most nuanced creation in fiction by a longshot.
And while I agree with MovieBob's quote there, I'm unsure if the scenario he's describing is actually what's going on with Man of Steel 2. The idea that "Batman vs. Superman" is the general premise isn't really founded on anything, other than the fact people (who aren't the filmmakers) keep calling it "Batman vs. Superman"