I think there should be a stronger biasing of the data towards evaluating total number of comments and downvote-ratio.

I'll be curious as to how this progresses, but I do indeed think it should be used with caution as it is, as this becomes available to "end-users" already the labels will be taken as true-beyond-doubt and cuddlekitten has been made aware of her new spammer-label by a few confused cuddle friends already.