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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".

Like on Fiverr where if I leave a 3 star review for substandard work, below expectations set by their portfolio, I feel like I've killed their dog.

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.