Meanwhile here few tips for fake reviews:

Select "Show only Verified Purchases" to get rid of most of fake reviews according to this 96% of "Incentivized Reviews" are not verified purchases

http://reviewmeta.com/blog/what-can-we-do-about-the-problem-...

Another tip is finding products with most reviews so you get more overall rating even it has some paid/sponsor reviews. "Most reviews" sort option is hidden in most of the categories but there is a way to do it. Here is my detailed writing about this. Disclosure: I am the author of medium story and http://www.jeviz.com which provides more sort options including "most reviews" to Amazon searches.

https://medium.com/@ceyhunkazel/amazon-search-hack-eliminate...