The most important quality that a designer can possess is humility, despite the fact that it is at least perceived to be so rare in design. If you have a giant ego or if you think that only designers are qualified to comment on design and that marketers aren't because they don't have an education in design, I can't really fix that in you. So go somewhere else. Design is not about the designer. It's about the user. It'sAbout solving a problem. And we're designing for a specific audience.