Amazon is having a serious problem with newly launched sellers who take the money and either ship nothing or ship something insignificant. It can often take a month for things to get worked out and by then the 'seller' is already gone with the money.
And aside from fake product reviews I've seen sellers with fake seller reviews. Here is my story.
I see a "new" pc from a seller with lots of great reviews for a decent but not absurdly low price. When I get the machine, the disk drive and some other stuff are loose inside the case so I open it up and put everything back where its supposed to be, but note in the process that the disk was made in 2012. Checking the smart data, its also been on and running most of those 4 years and is starting to get the "I'm going to die soon" whine. I also see that the windows license is a gray market job and the dvd drive was made in 2010.
I contact the seller, who lets me know he's just one guy working out of his garage. He insists that the PC contained 100% brand new parts when he shipped it, and that while I'm welcome to return it at my own expense if it has any old parts in it when he receives it he's going to charge me a restocking fee to replace them. I contact Amazon who completely "ole"s it and says that since the seller offered to let me return it, that's my only recourse. So much for the A-Z guarantee.
In going back to look at the seller reviews I see thousands, generally 15-20 per day. How does one guy selling mostly used computers out of his garage acquire and ship that many every day? About 5-6 pages of seller reviews in, I realize that almost all of them are titled "5 stars" and have one word in the review text, almost always "good" or "great", never any capitalization or punctuation. What are the odds that someone selling thousands of used computers every year never have a problem or complaint?
So I wrote a bad one star seller review with just the basic facts. Amazon accepted it and it got deleted about 2 weeks later, presumably when I wouldn't still look to see if it was there.
The message to me was clear. Amazon wants to make money and anything that disrupts that is quickly dispatched. They weren't interested in fixing my problem, the seller reviews were obviously faked through some means, and as long as the balance was positive they're okay with stuff like this happening.
I'd recommend only buying from amazon as the seller and fulfillment and not to count on the product reviews. I've already had plenty of companies show me how they end run around giving people free product in exchange for a review so it looks like I was a verified purchaser.