Completely disregard all Amazon Vine reviews.
Now weight heavily in favour of reviews that have had update edits - "it failed after 2 months. The replacement failed 3 months after that" (common on all makes of $200 LED gaming keyboards) or "after a year it's still in perfect condition". Photos on the reviews are often a good sign too - but only when there's just a few - photos on reviews are rare. So lots with similar framing would be an instant strike.
Try finding a CAT6a cable on Amazon - seems they're all 4.5 - 5* wonderful, yet dig into the bad reviews a bit and most of them don't even meet wire or shield spec. Even those coming from Amazon themselves.
Aside from reviews from specific, trustworthy people, reading the mid-tier and bad reviews gives a much better flavour of what a product is about, and the odd review tearing the product to pieces can be worth its weight in gold.
If it's a marketplace seller my starting point is to mistrust all reviews and let them earn trust really slowly.
I sure won't be going near Fakespot, especially when they're so intentionally vague in describing their own product - it'll be a score to game like your Klout score and all the other meaningless metrics. The astroturfers will adjust what's needed in the fakes to pass.