We're aware and have been discussing what to do about it. forum=3 is a different forum than most though so it was safe for me to remove the ability to rate from it without notice.
I posted some of this in the thread in =10, but I figured it was relevant here as well:
There's a vBulliten-based board that I frequent that uses a reputations system. You can only dole out so much rep per 24 hours. You have to spread it around before you can give rep to the same poster again, and negative rep is reserved basically for flagrant abuse of board rules. Basically, those who make the most knowledgeable posts or what have you end up with a lot of positive rep, but those who aren't popular or whatever aren't penalized by having people bomb them with negative rep. They just don't get rated very often.
The other thing about the vBulliten rep system the other board uses is that you see who gave you rep in your User CP. When you take the anonymity out of the equation, people are generally less downrate happy. Also, while positive rep does not require a comment to be given out, negative rep does require you to put a comment in there or it won't go through. Basically, you have to justify your reasoning.
Combine this with some Like/Dislike buttons on individual posts that don't affect the posters' rep so people can continue to anonymously voice their agreement or displeasure with a post (because people do
like to be able to say "I hate
this" with a single click), and add in a thread rating system where you can rate the thread
overall on a 5-star scale.