I was thinking something slightly different- a Karma system, like Allakhazam (ask Bodhesatva, he used to be a regular there- maybe he still is).
http://www.allakhazam.com
Basically, there are a few ranks: User, Scholar, Sage and Guru. Scholars and above can rate a post with a thumbs up or thumbs down. The post's Karma begins as Default, then can go down to Awful (or maybe it was Terrible, can't remember). It can also go up to Decent, Good and Excellent. Each classification of post gives you a Karma score. This score is averaged out. To quote the Site FAQ:
Q: I see posters rated as Scholar, Sage and Guru. What's up with that and how do I get a
title?
A: That is part of the Karma system. Your Karma rating is determined by averaging every rating your posts have received from the users of the site. The rating comes from posts made under your registered name on any of the rated forums for any game covered by allakhazam.com, but does not include posts on user journals. You must have at least 15 posts before you receive a Karma rating. Then any future post you make will start out at your Karma level. Anonymous posts start at a rating of 2. Titles are assigned to your posts according to the following scale:
Karma below 3 = user. Posts are in orange.
Karma between 3.01 and 3.65 = scholar. Posts are in light blue.
Karma between 3.66 and 4.34 = sage. Posts are in green.
Karma between 4.35 and 5 = guru. Posts are in red.
Administrators posts are in maroon.
Q: What are the karma ratings?
A: Excellent = 5.0
Good = 4.0
Decent = 3.0
Default = 2.0
Awful = 1.0
Now, we shouldn't copy this exactly, but it's a good foundation.
(Former) Lead Moderator and (Eternal) VGC Detective 
