I can't evaluate how serious or useful this is but I really like the idea. Anything that might encourage more constructive discussions is a perfectly valid thing to explore. I love the idea of trying to characterize the contributions of different commenters based on their history, including my own. Not just for things like "hatefulness" or "incoherence", which is what this seems to be detecting, but other things as well, like "helpfulness" or "erudition" or apparent areas of interest.