Sorry that you had a bad experience when providing your report. It rather annoys me when the client does not do well for some reason when I am performing a MS assignment because I know it means my report will be much more difficult and take a lot longer. I have found that I need to be very detailed and repeat any NO answers, explaining in great detail what happened instead of what should have happened.
Any client is pleased to get a good report but not pleased to get a bad report. Because a bad report may impact the manager's bonus or a number of other things, the manager will likely question and want more information. A negative report may well impact the individual employee(s) shopped, so it is human nature that a negatively-impacted employee may argue, give excuses, pass the blame. Knowing that, I work to make every report crystal-clear, providing every bit of detail that I have. I try to make it as objective as possible, leaving nothing for argument.
So far, I have never had a negative report refused. I rarely even get questions because I try to be so detailed that there simply isn't anything left to ask.
I've done many reports, both positive and negative, for RBG, and I've been paid for all and never noticed a difference in feedback received.