This is very anecdotal of course, but it did get me wondering. I have never written a customer review myself, but I always put that down to being busy/lazy and never saw myself as representative for that. But I asked around among my peers, people I would have wanted to read a review from, and it turned out I wasn’t the only one who’s never written a positive review. A lot of them, it turned out, write negative reviews for poor services quite frequently, but almost no positive reviews had ever been written.
All completely anecdotal, but it seems to correlate with what other people on HN have experienced. Maybe we shouldn’t have outsourced book reviews to the anonymous population of the internet?