To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.
I recently unsubscribed from 'Fantasy and Science Fiction' and was searching for a replacement. 'Lightspeed' was a good alternative, with (so far) fewer duff stories, and each story enhanced by an interview with the author and by a somewhat light-hearted science article discussing some of the background thought to the stories (more digestible, even, than 'Analog)'. I nearly subscribed, but in the end the pressure of reading each monthly issue before the next replaces it on the Kindle was too great. However, Lightspeed release their back issues at reduced price. All 2010 issues are on sale at 77p, a real bargain for stories and supplementary matter of this quality.