@sozobe,
Also -- I remember seeing Robert say this somewhere -- individual posts show the actual thumbs-down number, but whole topics do not. No matter now many thumbs-down they get, it doesn't go below "0".
So you can track it for a post -- first -3, then -4, then it's "below viewing threshold" -- but if you look at a topic that is "below viewing threshold," it will just show a 0.