Snyder was probably my biggest problem with Man of Steel
and the biggest element I'm worried about with this Batman
Sure, Goyer isn't the best writer either, but when he's paired with a talented director (Christopher Nolan, Guillermo del Toro) he can usually deliver solid results. That's why I'm hoping Affleck will have some influence on the story or direction - Affleck is a much stronger writer/director than Snyder and Goyer combined.
I'm also hoping another writer gets brought on-board to strengthen the script (a la Jonathan Nolan), but I'm not holding my breath. What's worse is that Christopher Nolan is playing a much more backseat role this time around, so it is possible Snyder will be even less restrained with this one.