On XBox Live there are two player ratings: stars, and feedback ratio. I have max stars, and 100% negative feedback. Think about that. It means 99.9% of people who play with or against me don't leave feedback, but 100% of the people who leave feedback leave negative feedback. Think about what this implies about people who report people, and people who don't report.
Edit: Expanding on this post, I think a player feedback system would be a good thing, as long as you accept that it will most likely serve primarily as a way for angry players to vent their spleens besides spewing hatred into chat. The numbers are never going to be reliably meaningful. It's usually a fool's errand to try to solve social problems with technology.
Aside:
Back in college, I played a lot of Halo, Call of Duty, etc. I really don't like players who act all macho, talk a lot of trash, and call anyone and anythign they don't like "***." You probably know the type. The reason I have a bunch of negative feedback is that when people did this, I'd hit on them (I am a guy). Example:
x/DeathStrike\x: "Hahaha, you guys all suck wang you hotpants-wearing sissies. None of you can match my skillz."
me: "Heyyyyy, your voice is kinda sexy. "
x/DeathStrike\x: "What."
me: "With a voice like that you've got to be pretty handsome. You into tall, skinny computer nerds?"
x/DeathStrike\x: "Ugh that's gross man you're ***"
me: "Is that a no?"
x/DeathStrike\x: "***"
me: "Oh yeah talk dirty to me"
*player x/DeathStrike\x has disconnected*
This isn't a word-for-word reproduction or even a paraphrase (this was years ago) but it's fairly representative. I was never obscene, but I seriously, no joke, got multiple people to freak out and rage quit, sometimes getting congratulated and/or thanked by other players. This has more or less completely stopped working, and I take that as a sign that we've progressed as a society and as a species.
VVV Really the game just needs a screenshot feature in general. Also, I know most MMORPGs have systems to log all in-game text chat. When a player is reported for something chat-related the gamemasters can pull the logs from directly before the report and look up what was actually said to see it in context (eg to tell who instigated an argument).
Edited by Blue Footed Booby, 14 May 2013 - 04:25 AM.