You have the right to....
State how you feel about your reading. What makes for accurate feedback ? How can one measure accuracy in something so personal and tenuous as feedback? It's a personal experience, a personal consultation, and a opinion about the interaction that you have had with a reader, and how you (the client) might see it may differ greatly from the (reader). It is your right as the client to be free to express your personal opinion about the exchange and who am I to say you are wrong? Who is any reader to say your opinion of the exchange was wrong? That is why it is called an opinion :-) We all have them, they may differ but they are ours and personal to us and our experience of the exchange....
I don't like sugar in my coffee or my readings, so I would not be happy with a sugar filled reading.... I personally do not choose to leave negative feedback, that is MY choice, but I cannot speak for others as to whether they should or should not leave, that is their choice.
Some people might think that feedback from a reader carries more weight, because they read themselves but in my opinion it's just the opinion of that reader..... And remember they are human too, not all knowing oracles......
It is after all an exchange of energy and it can go either way, so use the time you spend with your carefully chosen reader wisely. Be calm, be as centered as you can, and state your opinon of the reading even if you did not care for it.... :-) You paid for it, you can say if you liked it or not....
Joan