I am a frequent and faithful Amazon shopper, and like most, rely heavily on product reviews to help guide my purchasing decisions.
Recently I was shopping for screen protectors for a new phone. The item I decided on was highly rated with nearly 500 positive reviews, and a few negatives. Some of the positive reviews were obvious fakes - horrible grammar, nearly identical in content, etc. The overwhelming majority seemed legit, and the negatives were what I assumed were people who just couldn't install the thing properly - a common issue with most screen protectors. What I failed to notice is that almost none of the positive reviews were verified purchases.
It ended up that the protector I ordered was shit. When I went to return it, I noticed that almost all of the reviews were gone, and only a few negatives remained - which were all verified purchases. I had been completely bamboozled.
I decided to do what I should have done in the first place - use a review analyzing tool to check it. Since I don't want to be accused of being a shill (because I'm not one), I won't name which one I used, but the result was an F.
Out of curiosity, I ran the analysis on every other listing on the first page of results for my search. Only one screen protector out of 26 listings got a "pass" rating on the reviews.
TL;DR: Buyer beware: fake Amazon reviews are still rampant, and appear in very high quantities.