>>pg+(OP)
Would it be possible to make public a data set of heavily up-voted comments that suck and challenge the community to come up with algorithms that can predict whether a given popular comment sucks or not? I'd think you could get a fair amount of mileage just by measuring frequencies of certain technical noun phrases.
I paused for a second at the privacy implications of this, but honestly all comments are submitted here with the assumption that they will forever be visible and subject to moderation or critique.