You could leave sort of a neutral ref stating you received the racket but that communication was not so good and the racket was more used than represented in your opinion. At least that way, the next guy has a clue what he is dealing with if he buys from Mr. X.
A true 9/10 is almost new with minimal signs of use. A 7/10 has been used plenty, lots of scratches and chips, substantial wear to the bumper, grip is shot, etc. Really it is the difference between excellent used condition and very good used condition. Unfortunately, many sellers are overly enthusiastic when grading a frames condition.
Last edited by Fearsome Forehand; 01-11-2013 at 10:42 AM.