Death of online ratings as we know it

From the age of Amazon, CNET and eBay, many people become comfortable in evaluating things in absolute terms and relying on plethora of reviews for peer experiences with products or services. Five-star system became de-facto standard in rating. Why is it broken now?

What's the point of 5* rating system when 90% of ratings fall into 3*-4* category? 

Five star rating? History.

If

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