Amazon reviews can be the source of thoughtful insights. If undecided about purchasing a particular recording, I will often consult the customer reviews. Frequently I find the negative reviews, if not helpful, at least infinitely entertaining.
Usually they tell us a lot more about the reviewer than about the music. What they sometimes tell us is that the reviewer is kind of stupid.
This type of comment is one of the reasons I started a blog! Here are some of my recent favorites:
I am not a particular fan of Dorothea Röschmann, who nevertheless gets a lot of plum jobs in opera and choral works nowadays. (Brahms Requiem)
Lucky for her he's not her manager!