What data cannot be evaluated with a Standard or General performance report?
Impressions and eCPM by website
Clicks and conversions for individual creatives
The match ratio of third- and first-party audience segments
Viewability metrics across each IO and line item
The match ratio describes the similarity between the users on a first-party audience list to the users on a third-party audience list. It is not something that you can evaluated with a Standard or General performance report.
General or standard performance report is useful when you want to see changes in your campaigns’ performance.
Read more here: https://support.google.com/displayvideo/answer/3284116