I love data and do a fair bit of monitoring. I've spent a fair chunk of the weekend cleaning up my stock managements system and adding extra product information columns so I can run fast monthly reports by product sales/ group/ overall stock value for that group/ sell through rate/ overstock/ low stock. I have about 850 active products and then bundles of those so potentially around 1200 listings.
There is always a risk with setting up clever systems that you're creating a busy task. Are your issues so high that creating a system could potentially identify issues and change outcomes?
I skim review returns and issues volumes quarterly. I just look at orders and cancelled Historically mine have been very low, lower than peer average. I did identify last year that non delivery (or claimed non delivery no scan) was increasing as an issue and this tipped me into using fully tracked for everything prior to peek season.
I just went into eBay orders and in a few minutes pulled up cancelled orders, returns and disputes last 90 days. Are you sure you need more of a system than a quick monthly/ quarterly look?