Does Amazon actually have a problem? I have certainly encountered (and been paid to write as I answered one of the cards) fake reviews, but the products have always been ok. Not great, but for the $10 I spent, acceptable.
This seems mostly to be a technical complaint, in the way that people complain about Electron wasting RAM.
Search at least is nearly useless, because of the sponsored results that are extremely similar visually to desired results. I've also searched for books and gotten results that weren't sponsored, but didn't fit my keywords, just randomly placed in the list. Amazon also habitually combines reviews for different versions of a product.
Also, their drivers drop things off at your front door even if your apartment has a lockbox for that purpose, and there is no way to complain about it because the complaint process for "problem with order" only allows you to report "other issue" problems to the seller, not to Amazon.
And you can't turn off recommendations, but Amazon will happily make recommendations based on any porn you searched or purchased, so you can't use Amazon in front of other people without exposing your porn preferences.
In my experience, almost nothing is 10 bucks anymore at Amazon. Having prime would have meant - 5 years ago- that I would get it tomorrow or within 2 days, but now it means I will get it by the end of next week. Then the product I bought will come apart within 2 months. Right around the time the return deadline expires. The customer experience is at least one order of magnitude worse than 5 years ago.
Interesting. Where are you located? Here in Calgary, Prime is still same day or next day, with two days being for a few niche items (like a warehouse deal on a monitor).
They have a provenance problem. If you're okay with cheap plastic that may work acceptably for a while, it's great. But if you have a specific product or brand in mind, it's not a good choice.
Real-world example: I have a device with sensitive optics, and the manufacturer recommends a specific brand of lens wipes to clean them. The wipes can be found in some stores, but the manufacturer directs customers to Amazon to buy them.
That was good advice 5 years ago, but now the recommended Amazon listing is full of reviews saying that people received dry expired wipes, often loose in generic packaging.
I won't risk an expensive lens by using a possibly-expired cleaning product that has been comingled with counterfeits. So I buy the wipes from local pharmacies or camera shops, even if it means an extra trip.
These days, I have the same view for food, cosmetics, fire risks like chargers and batteries, etc. Today, there aren't many things that I do feel comfortable buying from "the everything store".
What I usually use Amazon for is physical media books and videos. (There's some irony there, similar to watching a music video on MTV.) Nobody counterfeits them (there are counterfeit Chinese DVDs, but I've yet to get one), and you don't have to worry about bad workmanship. They don't get fake reviews, although you have to ignore all the reviews of the wrong version, and they don't expire. And you don't need to look at them before you buy them.
This seems mostly to be a technical complaint, in the way that people complain about Electron wasting RAM.