Designing a MMORPG Feedback System

Gamasutra is running one of their highly enjoyable 'soapbox' pieces, looking at possible ways you could implement a feedback or ranking system for Massively Multiplayer Online Game players. From the article: "When playing an MMORPG, I should be able to give a positive, neutral, or negative rating to anyone who has been in my group for more than thirty minutes. Negative ratings could be characterized via a multiple-choice list of common gripes (i.e. 'loot theft', 'abusive language', etc) -- a feature now built into the Xbox Live feedback system. However, it isn't clear that a good feedback system requires this level of depth; there's an argument to be made for simplifying the process as much as possible."