I think Rob Toth's answer is spot on. Bankers do not often give feedback in a candid and constructive fashion, so there may be marketing or business concerns that you are unaware of. It is uncomfortable and challenging to keep the mandate after telling someone they have an "ugly child".
Bankers should be willing to share their outreach list so it should give you a better sense of how broad or targeted the marketing has been. While you have retained a professional to manage the process, the best outcomes often require collaboration and involved sellers.