I think this a constant problem with these type of rating systems.

We have also implemented one of the leading feedback-survey-customer happiness-system-things in one of our shops. The amount of negative ratings, because the shipping service provider fucked something up, is immense.

There is no way for us to really get those removed (integrity of the platform - good thing in theory) and commenthing something like "it wasn't our fault" doesn't really help either as the rating will influence the total rating one way or another.

Maybe that's cost of business, not sure.

The other problem with reviews is that they seem to be scaled according to price. A garbage product that sells cheap often gets reviewed as highly as genuinely great product that is more expensive.

Yep - and a lot of reviews are even people complaining about shipping which really is irrelevant (unless it's a packaging complaint about the product itself).