This is more of an announcement/FYI than a question:
Datacite has recently released a metadata quality dashboard, and you can explore your repository (or your competition :D) there:
https://metadata.datacite.orgOne thing of potential interest that's not well documented -- you can filter the results with query filters (not unlike in Dataverse). So, for example, if you're minting file level DOIs like we do, you may want to restrict to items with files (i.e. with related item has parts relationship). You can do that by adding