I was thinking of the Slashdot model too. Being able to tag posts as not just “helpful” or “unhelpful” but as “insightful”, “well-researched”, “comprehensive”, or “incorrect”, “lacking-evidence” could help. I think such labels might be best as optional tags though, kind of like how in Facebook the 
is still the default with 
, 
, 
, 
as extra options. Spam and “answers-different-question” (NaN) could even be included in the same system, as not all sites delete answers to other questions (which frustrates me to no end), while some sites could say that 3 “lacking-evidence” pushes it to a review queue just like a NaN would.
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