TL; DR: The culture from stackoverflow.com is mostly useful, but not all parts are a perfect fit for BSG.SE, let's only keep the good parts.
While I love that BSG.SE doesn't devolve into flamewars when people ask newbie-like questions and we can avoid having duplicate conversations, the "close thread to get better question and avoid subjective debate" stuff is out of hand. This is not a site where there is or should be a definitive technical answer to every question. Black and white rules questions belong here, certainly, but so do a host of other questions. "Why do/don't you like Race for the Galaxy" should be a fine question to ask. It is certainly subjective, but that doesn't mean it isn't useful and informative. I love reading both positive and negative board game reviews on BGG, especially when they give the profile of the boardgamer and the specific features or design decisions of a game that are liked or hated.
As long as we are respectful of each other, we should encourage subjective discussion. In not doing so, we are simply throwing away an opportunity to grow the community in a fun and spirited way.
I administer a board game blog devoted to just Dominion, with just 3 top level articles per week, and it gets substantially more traffic than this site (according to the merge or close thread from Jeff Atwood), and a big factor in the traffic is the encouragement of spirited, subjective and opinionated debate among relative experts. Certainly sometimes I'd like the ad hominem attacks there to not happen, but given the choice of the sterile "close anything very open ended and non-definitive" and the aggresive anything goes but let's at least try to keep it civil and somewhat on-topic style at the DS.com blog, I vastly prefer the latter.