Well, here it is straight from literary agent Jessica Faust at Bookends, LLC:
Publishing is not about selling a good book. Publishing is about selling a book that will sell, and rarely does that have to do entirely with how good the book is.
So there. It's a minefield out there, and being given a rah-rah pep talk isn't helpful. What a writer really needs is an honest critique and help seeing where their artistic vision fails to align with current market trends in style and content.
Mindless boosterism should be left to professionals. . . like the Dallas Cowboy Cheerleaders.