The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
Ad Quick is brilliant in giving us a solution to place a collection as a product within a collection. It's a wonderful way to do just that without having to list every product within a collection. Support is great too, they were fast in responding and helping me out to make the app compatible with the theme I am using. Thumbs up to Ad Quick!