the presence of feedback for a member on A'gon is only useful to show the person is legit or not. Any system that has a binary rating scale (ie favorable, or not) is of little use otherwise. I've had a few transactions here with members who had extensive favorable feedback scores, where my experience was less that outstanding (though still satisfactory).
I would really prefer a 1 to 10 rating scale with criteria spelled out as exists for the condition rating system. Further, the only disputing of that rating should be via a rebuttal comment. It would also be preferable to have the 1-10 apply in multiple categories like ebay has done. Then, the verbal input is no longer needed, but it too is marginally useful since most of the comments are trite anyway. This is more complex, and doesn't solve all of the problems but would provide more meaningful ratings to judge by and set your expectations.
I would really prefer a 1 to 10 rating scale with criteria spelled out as exists for the condition rating system. Further, the only disputing of that rating should be via a rebuttal comment. It would also be preferable to have the 1-10 apply in multiple categories like ebay has done. Then, the verbal input is no longer needed, but it too is marginally useful since most of the comments are trite anyway. This is more complex, and doesn't solve all of the problems but would provide more meaningful ratings to judge by and set your expectations.