I have and only will leave feedback after the deal is 100% complete. I have for the most part been 90% buyer/10% seller and this system has worked well for me. Just becasue someone sent me the money doesn't grant them a positive rating 5 seconds later.... a deal to me constitutes good communications, delivery of money, satisfaction by both parties on deal after the seller gets money adn the buyer gets goods etc. once everyone is happy (or not) then feedback is left.
I do agree that the rating should be a 5 star thing .. 5 stars perfect, 4 being slow communication, bad packaging, or whatnot, 3 being slow delivery or stall tactics, 2 being not trustworthy or whatever 1 being he's scamming you.
somethign along that lines at least. *shrugs*