hey lugh ive had too much wine already. cheap red wine out of a box. you know what that means. i start typing and i cant stop myself.
so...
Well rating systems generally try to give us some kind of predictive score, - something one would call a measure of central trendency if one had the misfortune of spending too much time in stats courses.
What we usually use is an average (1 to 5 stars) or the sum of pluses and minuses. An average is a measure of central tencency as long as the underlying population from which the scores are obtained is normally distributed which stars can sort of be.
The sample population of 1s and -1s cant be normally distributed so if 100 people rate something and half love it and half hate is you get a zero and it looks like no one likes it. the rating in such a case actually describes no ones opinion at all.
In a way the people who tend
not to give negs have modified the +/- system to a +/0 system which at least always presents some descriptive information acurately reflecting the votes, i.e., The number of positives are tabulated and to the degree they exist the information is useful.
another way would be to have two running tallies: a plus tally and a minus tally. so a story could be rated... 50 people love it and 50 people hate it. which would be interpreted differently than a single score of zero.
HOWEVER because the present system takes points away from a score it does have a built in conscience so to speak that encourages all but evil or careless people to carefully consider whether a negative click is called for. So i MAY actually favor the existing system even though it may not always provide an accurate measure of central tendency.
Ill need to drink some more wine and think on it some more...