Maybe I should have asked this in the definition phase, but better late than never.
I'm considering asking a question which requires a subjective response - something what made left the biggest impression on the readers. The intention is to get sci-fi recommendations.
Are we banning subjective questions? Seems a shame, but I would rather find out here than getting it closed.
I suggest that part of the answer depends on what kind of site you want. If you want a community, you need some latitude in subjective questions, just like meta.stackoverflow. If you want factual answers only, be aware that you may end up with Wikipedia-lite.