Here's the guidelines on Good/Bad Subjective questions http://blog.stackoverflow.com/2010/09/good-subjective-bad-subjective/
Here's a follow up: http://blog.stackoverflow.com/2011/01/real-questions-have-answers/
Over the past several days I've come across more and more closed questions of the form "Can you recommend xyz?" Many of these usually have some answers and usually good and helpful ones. But since they are closed, the conversation is stopped. These are apparently "bad subjective questions" (despite the fact that some of them are actually pretty good).
Then what is the job of a moderator? Spam filter? Question remover? Rules enforcer? Human-powered question categorization engine?
Except for the last one, that sounds more like a police office or some sort of enforcer. I'm not saying that work is not needed but in my mind a moderator helps guide a discussion. Think about the last time you went to a panel talk with a really good moderator. What did that moderator actually do? Did they yell at people for bad questions? OR did they re-interpret "bad" questions and turn it into a good discussion?
Maybe there should be a new role, "content-advisor" or something?