https://www.fakespot.com/
Plug in a url and it will gauge reviews on retailers: Amazon, Best Buy, Walmart, Steam, Sephora
Also works on Yelp and Tripadvisor.
Here is what they thought of the seller of the screen protector I posted a few weeks back which listings reviews and questions didn't match the product (listing is now fixed):
https://www.fakespot.com/product/xawy-2-pack-for-galaxy-s8-plus-screen-protector-tempered-glass-anti-fingerprint-no-bubble-scratch-resistant-glass-screen-protector-for-samsung-galaxy-s8-plus-7a6503ad-0ec0-43da-b7d7-6f49f8ce2fcb
Seller rated D, reviews rating now shows B since this product reviews are now fixed. It was F. Seller rating has remained D.