I think that the number of 'positives' (+) and 'negatives' (-) that users apply to comments should both be shown as real/cumulative numbers; rather than the current situation whereby a neg cancels out a poz and vice versa. Why not show all the 'data'/responses? Under the current system, a lot of potentially interesting information is lost, and it could also result in some pretty drastic misrepresentations of what the general sentiments are among users.
As examples:
A comment could attract a hell of a lot of votes, but if the numbers of poz and neg votes are approximately equal, it will 'appear' as though hardly anyone has voted/taken an interest. 102 pozzes and 100 negs for example, would show as "+2".
A comment could attract only slightly more negs than pozzes, but if the overall number of votes is large, it would 'appear' (incorrectly) that the vast majority of users disagree with the comment. 209 pozzes and 217 negs for example, would show as "-8".
A comment could attract quite a few votes, but if there is an equal number of pozzes and negs, it could appear as though/ be assumed that no one had voted/no one was interested in it. 21 pozzes and 21 negs for example, would show as "0".
I could go on/ there's various other examples/scenarios under which meaningful information is lost/obscured because of the somewhat simplistic 'neg cancels out a poz' system used to reflect the voting on comments…
So why not show the actual number of pozzes, and the actual number of negs?
How would that be implemented? Currently it's relatively easy to click on the 'votes' below each comment and see the number of positive and negatives, for those who are interested in that sort of data.
I agree it can throw you off sometimes, for example, when reading threads and comments appear to have zero + or - votes at all, when they actually have an equal number of both which thus nullify each other… but if you're the kind to read threads thoroughly, I'm sure those comments would stand out enough content-wise as being polarising/controversial (possibly?) in nature enough to make you suspect it would have garnered some votes, which would then lead you to click on the 'votes' button out of curiosity. At least that's what I always do. Those sorts of polarising comments also tend to have replies too, which can be another indication of 'hidden'/cancelled out votes (uh, if that makes sense).
Then again, I tend to look at the actual vote counts of all posts I find particularly interesting.. Instinctive browsing habit now.