Half the listings are sponsored ads when I search. I searched for "Lego" this past Christmas and on the first page I got a bunch of products that were in what looked just like Lego boxes with Lego fonts and numbering ... but were not made by Lego and were clearly made to deceive.
I noticed some items I get price alerts now will drop low but only one vendor is actually offering the low price ... who has terrible ratings. But you can't actually know that is happening unless you click through the UI a bunch, if you just buy it you'll see the overall rating that is fine... but you get it from some vendor with terrible ratings.
I bought something last spring that was never delivered, turns out it was some random Chinese company. The item even says it wasn't delivered and yet I couldn't get a refund if I went through the order status page. It just sent me to one automated customer service who sent me to a different customer service who sent me back.
Someone on HN had to tell me to go to the front page and contact "that customer service".... wtf
I used to go to Amazon because it offered better selection and quality products that my local stores didn't sell. Now it's just low quality garbage and scams.