Controllers don't get such a heads up in the real world. I wouldn't want one here. As far as I'm concerned, if it's a machine being flown by a human, it's subject to some sort of failure. Whether that failure gets announced and I have to do anything about and how realistically/well the pilot deals with it is part of the randomness and magic of being a controller....
I hope you'll consider that every argument is two-sided and any individual pilot does not often have the true picture of the entire airspace covered by the controller. Just because a pilot thinks the controller should have been able to handle it, doesn't mean the controller truly should have been able to. I truly hope a controller's rating isn't affected solely by a pilot report; rather, both sides of the issue/argument is reviewed and adjudicated before any controller's rating is affected.