User generated reviews, in general, have a very interesting dynamic to them.

They will invariably skew negative, perhaps overwhelmingly.

Suppose you manufacture something rather mundane and utilitarian....say a toaster. You sell 1,000,000 of them on Amazon. Because you put lots of attention to your quality, you have a failure rate of only 500 units per million produced, giving you an amazing 99.95% success rate.

Now on Amazon....if your toaster actually toast bread, the average user won't be incentivized to write a glowing review....since how exciting is a toaster that toast bread?

However, a toaster that doesn't work, the user may be very motivated to write a negative review.

So, a 99.95% success rate, may translate to 600 positive reviews and 400 negative reviews....for a very lackluster final review stat