Throughout the software development life cycle oodles of data streams into the Team Foundation Server data warehouse. It takes many data points to illustrate a trend and guide decision making for managing a project. The two process templates that ship with Team Foundation Server include a number of reports for visualizing this data. However, do they answer the questions you're asking, or the questions your stakeholders are asking you?
The Team Foundation Server Reporting team developed a brief (15-minute) survey to assess your reporting needs as they toil away on the next release of the product. By participating in this survey, you may very well save yourself the time of creating your own custom reports. Take the survey and let your needs be known!