I'd suggest using both FakeSpot and ReviewMeta together. In the end though, neither should be treated as perfect. They both can give skewed ratings on legitimately good products. It just helps give an idea of if you should be cautious and look into things more before purchasing. Source: about 1 year ago

I recommend https://reviewmeta.com if you want to see if the reviews are authentic or not. Source: about 1 year ago

This does a pretty good job of filtering out the crap - https://reviewmeta.com/. Source: about 1 year ago

This is only for amazon, but https://reviewmeta.com/ checks if reviews under a product are likely to be real or not. Source: about 1 year ago

I'll also double-check those Amazon reviews with a tool like Reviewmeta to see if they have a high number of suspicious or fake-sounding ratings or comments. Source: over 1 year ago

You can find user reviews of random ICOs with horrible spelling errors and critiques here: icorating.com and topicolist.com. Source: about 3 years ago

Other decent ones I look through are ICO Hotlist (https://www.icohotlist.com/), Top ICO List (https://topicolist.com/), and ICO Holder (https://icoholder.com/). Source: over 3 years ago