I guess if you operationally define “nothing wrong” as a failure to work as the manufacturer intended that would be true. But is that what really matters? What is the number of defects that should be counted?
The design of the phone is broken if 63% of the returns work as intended and customers still think they are broken. You might argue that the instructions are bad, but really shouldn’t people just be able to use the phone if it is designed well?
continue reading: Usability Failures