Factually incorrect or relevant but info-light statements are often just as much noise as off-topic comments. For example, the top-voted comment on a post about

Factually incorrect or relevant but info-light statements are often just as much noise as off-topic comments. For example, the top-voted comment on a post about Clojure says "Clojure is such utter shit. It doesn't even have integers. Don't use this crap." Are you really saying we shouldn't downvote that? The one bit of signal (it doesn't have integers) is false, and the rest of it is just flaming. By your metric, it's a good comment — it's on topic and it's not spam. But by any reasonable metric, it's a terrible comment, and I would like to discourage such mindlessness.