It's been tried a few times, and it seems there is much voice against it, than for it.

Not to mention the amount of abuse it seemed to spawn, directed at certain members & such..
(Marc, didn't you get very very deep into the negatives?!?)

Rating the post, cool. But it seemed to also rate the poster, bad.

(And it starts to make you feel bad & small. Not a good thing for someone's self esteem.)

You can always post to object to the offending post, post a correction, and/or offer another angle on the post..