Before scrapers used to outrank you. Now they just take you down with them but will not outrank you. I have seen this on many many many sites.
Its astonishing how even a little copied text will hurt your ranking. I have seen facebook posting hurting rankings too. The text that you add to you FB posts will hurt you in this update.
The only people to escape this are the big boys with huge link buying power. That is why you will see a handful of sites repeating on the first page for all keywords you search for in a niche.
All medium and small guys are being systematically erased from the serps.