Get rid of percentages linked to stars
It is so disappointing to see your percentage drop due to a four star review.
I have experienced this and seen it happen on other shops. The customer is very pleased with the item but takes off a star, because for instance, it is a gift and hasn’t tried it.
This is upsetting as you can never recover to 100% through no fault of your own. It doesn’t look good to a potential customer either if the percentage rating has dropped.
Let’s just have a star average instead.

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Chris Witcomb commented
I have had this happen to me too - if you don't have many reviews to begin with, one or two 4-star ratings can really lower your percentage very quickly and you'd need many more 5-stars to bring it back up again. It's very demoralising when you've been marked down without a valid reason, I agree that a fairer way would be to remove the percentage score and keep the stars.