Voyager

I would probably want this in some sort of score/percentage mix. Like if a post had 15 upvotes and 20 downvotes, I would probably still want to see it as it just means it's something controversial rather than low effort/quality. However going off of percentage alone wouldn't work well in the beginning if it was immediately downvoted two or three times.

So probably more like:
score lower than {user_defined_low_score} AND score % less than {user_defined_low_percent}

We could also probably apply this to comment scores as well so we can avoid having to look at 2 users being petty towards each other... like what played out in one of the other replies to this comment.