The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
App has a glitch which causes the cart no to function properly. Another glitch causes the app to install in backup versions of your theme. This caused a myriad of issues and an expensive process for diagnosing. Support was friendly, but seemed to either not completely understand the issue or lacked understanding on how this affected us with regards to time/money. They offered a discount, but other issues with the app means even a discount doesn't make the app worthwhile. For example, you have to create upsell widgets one by one by one. This may be sufficient for a site with only a few products. If you have the number of products we have (4000), its just not realistic to consider an app that requires us to do anything one product at a time. We'll swallow the cost of our developers 5 hours of diagnostics and move on.