Challenging Internal Dynamics

Hi. I have previous experience working in sales where I did very well. I considered myself quite a good salesperson and one thing that helped to show that was the sheer number of referral clients I received. I left that position for a start up tech company (they have been around for much longer but this is a new division). The product seemed very interesting with a lucrative potential based on deal sizes (inaccurate info given to me) and the commission percentage. Sales have been absolutely dismal. They promoted me to Sales Lead and I had some interesting ideas for growth. However the customer feedback has been very poor, almost all of our demos have been returned without a desire to sign on, and we have received a lot of feedback on issues with the product from current clients. We have tried many different angles for sales but ultimately I believe the issue is the product itself. I am now in a position (I am the only one who has closed anything since January) where the deals I have closed are going out for implementation and issues just keep coming up. Ethically I feel awful selling something I know is wrought with issues. I have attempted to raise concerns with the owners however their tunnel vision of success being inevitable means they believe the issue is with the sales team and not the product and they disregard any negative feedback from clients. Am I right to GTFO?