The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
It has potential. But, this should come out of the box for shopify plus users.
You have to hire a developer to create something for you.
Also, it's limited to 1 script at the time.
Shopify should really work on the Discount Options and Shipping options on their back end so users don't have to spend more money to hire developers. Specially because their Plus plan prices are going up.