I'm not sure that a somewhat arbitrary numerical scale is the best way to track contributions. especially when the upvote/downvote buttons still seem to mostly be used for 'asshat --> non-asshat' differentiation.
Then we need to do a better job letting people know that it isn't "I think you're an asshat and I disagree with you breathing on this world" and it is "your answer isn't of a sufficient enough technical quality to serve as a useful response to the OT". With the old system we never said much of anything as to what the numbers meant.. with this one we will be explicit.
Then I think there will need to be some sort of Editor role then to adjudicate votes/submissions.