[humj]

I think what you're talking about is graphics rather than design. To me, design is the umbrella term encompassing UX, UI and graphics. so I'll rephrase the question: Do graphics matter?

While it may not the biggest part of design, graphics still do matter. "The way things look" plays a big role in how your eyes move through the space of your product, where your attention goes, and ultimately, where someone decides they've had enough and are ready to leave. Basic Examples: is the call-to-action button colored in a way that I can spot it instantly? Is the text readable enough that I'm not fatigued after a few posts?