While I had my difficulties with some of the facilities in the past, I am not sure if it makes sense to simply compile and publish a list of companies with which we are not happy.
If we want to have a constuctive dialogue and raise our voice as customers, then it must be supported by Facts and Details and in a polite way.
Any Managing Director from any Maintenance facility, which I have met in the past, had always an open ear for constructive Feedback.