The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
I don't usually try apps that have less than 30 day trials because that isn't sufficient time to see if its going to work for you. Anything less than 30 days is a developer that doesn't have confidence in their app. This one turned out to be exactly that - pretty useless. You can't pick the variant you want to show, its just splits them all up, so too strict, and the only other feature is the Add to Cart button which you can get for free from other apps, so overall disappointed.
I am so sorry you do not like this app, but we appreciate your opinion. Anyway I saw you still use this app. If you will need help with something, please just let me know about it.