I trust Snyder to do one thing -put eye-catching visuals on screen. Let him anywhere near a typewriter, and he's a menace (I cite Sucker Punch, and a Superman movie with an imposter, not Superman, and Pa Kent who was the exact opposite of what Pa Kent should be).Ben Afleck will make a fine Batman. When it comes to the Dark Knight, you need only have two concerns--does the suit look cool, and will the director respect the material. As for Fleck's acting chops, check him at as 'Superman' George Reeves in HOLLYWOODLAND. Good flick.
I trust Zack Snyder. I think Superman/Batman looks killer. Definitely taking cues from Frank Miller's brilliant DARK KNIGHT RETURNS.