How Goodreads Reviews Can Tank a Book Before It’s Published

The website Goodreads has become an essential avenue for building readership, but the same features that help generate excitement can also backfire.

The New York Times
The problem with GoodReads is the same problem with most sites that lean on crowdsourced content: without very active moderation (which doesn't scale), bad actors will game the system. People take advantage because they can. It's human nature, and it sucks.
@flargh Worse is how much Goodreads can affect authors. :/