There is much debate on many of the author forums with regard to this subject, and whether or not there is any significance in reader reviews.
As you may, or may not know, anyone that contacts me, I generally ask them to leave a review on Amazon and Goodreads (provided they have an account with the site).
The only reason I ask this, is that it helps potential new readers gain insight into another’s unique reading experience, and thus assists in gaining a new author exposure.
Regardless of what many may say, reviews do generate a new audience and a following, and they also determine whether or not someone will take a chance on a book, especially those of self-published authors, who do not have the marketing capabilities of a publishing house behind them.
On that note, if you do come across a book that has piqued your attention, that has made you laugh, made you cry, or provoked your imagination, please leave the author an honest review.