After asking my question about Stargate Universe, I saw a related question that had been closed for being "Subjective and Argumentative": https://scifi.stackexchange.com/questions/431/what-was-the-biggest-reason-that-stargate-universe-failed After reading through the questions and the answers, I disagree with the decision to close, but I certainly can see why.
It does have high potential to generate subjective answers, but as with other se sites: subjective answers don't make a question subjective--it just makes them bad answers and they can be downvoted as such.
The question isn't unanswerable--if fact, the answer obviously exists. Are questions being closed because of the low probability of the actual answer ever reaching scifi.stackexchange.com? Or is this a tactic to boost the %answered stat?
The https://scifi.stackexchange.com/questions/431/what-was-the-biggest-reason-that-stargate-universe-failed question fits the FAQ perfectly: https://scifi.stackexchange.com/faq Does the FAQ need to be updated to exclude (rather than include) these sorts of questions?
Most of the closed questions that I come across, I agree with the decision. But in this case, I think this one should be re-opened. It has a discrete answer (sure, an answer most of us aren't privy to), but that answer will never reach the question if it's closed.