Yeah, all the ones that start with "I received the complimentary product" in some form.
That's a bogus review, it's paid. You might argue free product is not payment but the IRS would then like to have a word with you (ask the people who got "free" cars from Oprah).
This is fairly anecdotal, but I've read some people's experiences with free products for reviews. They received products while they were giving good reviews. The products stopped once a bad review was posted.
Amazon also gives free products for review (Amazon Vine) but these are made very clear with a banner above the review, and will remain part of the program so long as they continue to receive a high number of 'helpful' votes on their reviews.
"Do you have any data to back up the claim that most of the recent reviews are bogus?"
Yes, after buying numerous products with great ratings and discovering that the people who rated the product negatively were often right about their complains.
From what I have seen people don't put to much effort to praise products, however they take the time to complain when they feel unsatisfied or burnt by a product.
I'm not trying to convince you or anyone but this methods has worked rather well for me.
Most people don't put any effort into writing a positive review for a product that does what its suppose todo or exceeds expectations.
I than take all the negative reviews and see the common reason for the product failure than determine if that is a concern for me ,before buying.