So...looks like this is gonna be a thing...
An author posted this text from Amazon, in the Writer's Cafe:
"Our shared goal is to provide the best digital reading experience for customers on Kindle. When customers contact us with quality issues in a book you published, we validate the issues and send them immediately to you to fix.
Starting February 3, 2016 we will begin showing customers a warning message on the Amazon.com Kindle store detail pages of books that contain several validated quality issues. We will remove this message for a book as soon as we receive the fixed file from you and verify the corrections -- typically within 2 business days.
We understand that even with the best quality controls, defects sometimes make it through. That's why we've limited this messaging to books with several issues. Books with more serious quality issues will continue to be suppressed from sale."
Seems an odd way to handle the issue, to me.
"Attention customers: please be aware that some of the items we sell are validated crap. Only fair we should warn you right up front.
Have a nice day!"