When a user is connected to the instance of SQL Server that has an MDW on it and they are a member of the mdw_reader role for the MDW, the following problems exist.
1. When the user right clicks on the MDW and selects the Reports menu, the Management Data Warehouse report is not displayed.
2. If you work around problem 1 by granting view definition rights to the mdw_reader, when the user clicks on any of the three collection set reports, an insufficient permissions error is raised.
The help topic suggests that users that have mdw_reader rights can view data in the MDW. The problem is, they can't view the data using the MDW reports!