Well first thing I want to address, is that the indicator isn't used for people to get competitive over. If you have 50 reports with 50% accuracy, that is still highly appreciated. Getting your score as high as possible isn't a huge concern.
I didn't mean to start this topic as a competition about the metric. My concern is that I'm being shown that sometimes I'm innaccurate, but I can't really tell which of my reports were the innaccurate ones. That seems a little broken. Why tell me at all if I can't use the information to improve?