Most products sold on eBay / amazon are too simple for detailed seller ratings to matter. The usefulness of a 5 star review system is far higher when there is a wide and fairly continuous spectrum of expected performance (food, airbnb) compared to a binary choice between "something this simple really shouldn't break so easily" and "it works fine".
There really should just be a "things went fine" and "something went wrong" toggle, with the option to leave a more detailed bit of feedback. "93% of people had no issues" is a lot more meaningful than "4.3 stars" to me.
To me, the real bullshit is the expectation that anything other than a 100% 5/5 score is an indicator of serious fault.
If you leave 4/5 as an eBay review for example you have pretty much offended the seller.