Your product is only as good as a user’s perception of it.
So you want to manage a product?
Rohini Vibha

This is a great truth, at the end the user is who can say if the Product is good enough. But sometimes this has to be a team effort with marketing team, you can create a Product that solves a common problem and with a UX that generate engagement just as the user login, but if marketing shows the value proposal wrong, maybe your wonderful job as Product manager could be at risk. Team effort thats another key.