Re: What's the worst that can happen?
Snyder completely focusing on Batman and Superman kicking each other's ass and ignoring making the actual story engaging. There should be great banter between Superman and Batman, if they don't get that right then they've already ruined the Batman/Superman dynamic.
And I'm very worried about the above happening with Snyder directing and Goyer writing. They picked the worst combination. The dialogue in Man of Steel was shallow at best and Snyder could barely hold the story together. Dammit WB.