The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
They don't reply to emails from myself or from the Shopify staff when I had issues with the sharing bar effecting my navigation menu. I can't access any of the analytics - they also have not replied to me asking them how to access. I pay for this app as it looks good and performs well on my site but their service is dreadful and if I could find a social share app that looked similar I'd change in a heartbeat.