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Users want the comment to be on topic
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Word count similarity between both title and body ^
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Users want well written comments
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Flesch-Kincaid Readability (comprehension difficulty)^
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Gunning-Fog Index (writing grade level estimate)^
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Average sentence length ^
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Number of words in comment ^
Number of characters in comment ^
Average syllable ^
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Users want novel discussion
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Frequent word index (how often the comment uses words that are frequent in comments generally ^
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Number of sub-comments ^
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Users want rational comments, not emotional
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Emoticon count ^
Punctuation count (repeated exclamation points) ^