The ratings for forum posts has been a difficult one to figure out, so we're trying out some new things. For now, only a total karma score will show, so you won't see the likes and dislikes broken down. We'll see if that helps keep things honest.
I'm rather disappointed by the re-introduction of the karma system - it still gives a global evaluation and not a per-post one, and people who have a non-compliant opinion are still bound to end up down on the scale. This is because the main shortcomings aren't fixed:
* People will still click "dislike" if they do not agree with a post, i.e. dislike the argument
* You still don't know why you've got bad karma, making it impossible to adjust (or even to think about it)
It seemed more mature without karma in the short meantime because I don't need a rating to ignore troll comments and it doesn't replace a moderation of a forum.
We may be moving to new forum software, and will have the ability to do "post ratings" right off the bat. Currently there is nothing available for our forum solution. That IS an ideal solution and one we hope to have sorted one way or another.