If you clicked on the link above, you will see that nearly 40% of the Amazon reviews are 1*. There is a good chance that most of those people received a dead PS4. Agree that not everybody who received a good PS4 left a positive review but this certainly does not make it looks like a minority.
Definitely reaching there - you can't assume a large majority of people who ordered from Amazon are leaving reviews. You already know that people without a working console will no doubt go leave a review, so the sample is significantly skewed.
We won't know if this is a real problem until Sony says something.
Disclosure: I ordered my PS4 from Amazon in June, received it yesterday, it works fine...and I have no reason to write a review about it.
Also, it looks - at a glance - like more of the 5* reviews are from verified purchasers than the 1* reviews. Presumably a bunch of people who didn't buy from Amazon and had a DOA PS4 went onto Amazon and posted an angry review, but people who got a working one had no reason to.
Those of us who got a console in good condition most likely don't post. I got a launch console from Amazon & even applied the update, and it worked like a charm. I've no complaints so far (minus the horrid launch lineup).
If after using only xbox, you bought and received a PS4 from Amazon, would you leave a 1 star ranking because of the interface look? 3-stars, maybe; 2-stars, maybe; but if you put 1* on the first day after paying hundreds of dollars, then it means that you had some serious unexpected, unwelcome surprise.