When I see a Magento question on Stack Overflow that doesn't belong there (i.e. it has no programming aspect at all or is extremely specialized) I tend to tell them to go to http://magento.stackexchange.com and ask there. I try to filter a bit - if it's an extremely low quality question, I will just vote to close. But even with that, most of the questions that we are talking about are of.... borderline quality.
SO's sending users with questions of less-than-perfect quality to other, smaller sites in the network has caused trouble in the past because those new users were perceived as drowning the place with their questions.
Does Magento.SE have problems with its incoming user / question base, or is it more tolerant towards questions like "how do I implement feature X???????" or "X feature in my Magento install doesn't work???????"
tl;dr: Should experienced users on Stack Overflow continue recommending Magento.SE to people with relatively little discrimination, or should great care be taken that the questioner has an actual high quality question?