I don't think that the repping system is really needed on this site. Too often I feel that some of the people that comment on threads say something positive just so you get rep. It feels like to some extent, I do that too, and sometimes I just want to compete with people on getting rep points (I know very childish of me, but I'm sure I'm not the only one out there).
Then again, also I agree that too often people downrep with very useless comments. Thing is, if you disagree, the person who posted wants to hear WHY you disagree, not just a face that frowns under their thread. I wouldn't mind thumbs up or thumbs down on a entire thread, but for each reply/post, it just doesn't seem necessary as abuse and being bias is just way too easy to fall for.
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