Design arguments: Does bad design mean no design?

In Of Designers and Dunces, Roddy Bullock entertaininglyly addresses the claim made by Professor Donald Wise of the University of Massachusetts that defects in the human body show that there is no design in nature.

Unwise person: I’ll admit it's art, but it's bad art.

Wise person: But you will agree that it is the work of an artist. Yes?
Unwise person: No.

A "bad design" claim, if sustainable, might come better from a medical doctor than a geologist, but medical doctors do not appear to be among materialism/Darwinism's fans.

My other blog is the Mindful Hack, which keeps tabs on neuroscience and the mind.