I have one site that has affiliate round up style articles that got wiped out by the product reviews update last year, mostly recovered, and then last month's update wiped it out again. I have other affiliate sites that aren't product roundups, affiliate links hidden from Google behind a funnel of a couple other pages, and generally those are doing even better. I think Google is cracking down more on sites with a bunch of product roundups that have the same information as the manufacturer and not much informational content.