We usually expect Design to be practical, functional. What about another aspect that is important? The fun to use it, the sheer beauty of the design. It turns out that our brain is wired in such a fashion that we can be more creative, and better problem solvers, if we are happy. So it also pays to use design that makes us happy.
I'm a big fan of having fun. What makes you happy? As Don Norman puts it: "so that's the new me, I only say positive things."