Sounds craptastic.
Is that just a Del Rey issue or is that industry-wide? It seems to me that you'd want to put your best foot forward on the cover because, let's face it, we all judge books by their covers to some extent. And if you have an author who does good work for you, I just dont see why its so hard to take more direction from them in the art department. They have to draw something, why deliberatly draw what you don't want?
*shrugs*