As there is usually discovered on a Forum, a thread which directs individuals to Services that have been satisfactory and recommended, i.e, Third Party Cartridge Services or Overhaul Services for equipment.
A Thread such as this will become obscure and buried, to avoid this, there can also be a Thread Created, preferably by the Administrators, that creates the Opportunity to list Services with a history of Customers who have a outcome of dealing with the Service have not being satisfied.
Services only need to be listed not named and shamed. The other info can be shown through a Link added to direct to a thread where the Service is being reported on by a Customer/Customers. I'm sure that within a List, if a Service was to have shown a list of links to show how Customers feel about their interaction and if these are where the Customer has had an unsavoury experience, the phone will steadily ring much much less for such a Service.
The Administrator are leaning heavily towards the Forum being a place where Vendors have a free reign to promote wares for sale. The Administration would best serve the Forum Members by supporting a Space on the Forum as a one stop shop to speedily see if a Vendor has adeptness at creating disgruntled customers.