Word count would give you an idea, and I think (don't know) spam detector software would weed out posts that were too similar. Also whether the comment was responded too and how many times. Quality comments usually get responded to and a thread is created with more than two entries.
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I think the above would definitely help guide, but there are always anomalies. I think quality is in the eye of the reader, and that's really tough to assess with code.
Absolutely:):):)