To sit there and insist that you can’t critique the movie’s story without first seeing it is just like saying you can’t like a song’s lyrics unless you’ve heard it on the radio first. It’s irrational.
I feel the same way. For example, I’ve read enough synopses to know that Man of Steel is an affront to everything I love about Superman; I don’t need to see the film to come to that conclusion.
Sure, the direction and acting have an impact on the final product, but poor writing is poor writing; the former may make the latter tolerable, but they don’t negate it.