GoodReads has made some changes.

From BookRiot:

To be clear, Goodreads is not deleting user reviews here, but they are segregating reviews that fit their definition of what a review is from those that don’t fit it. If the great majority of readers agree with this definition, then they won’t have a problem. But I do wonder that this tamping down of discussion will frustrate some users. Balancing vibrant reader participation with author and publisher expectations is a tremendously difficult task, especially when your business depends on readers wanting to say what they think about books—and their authors.

And here's the relevant GR thread.