well, then good design and popularity are the same… I am not necessarily disagreeing with that, we started down this road when I wrote that popularity is important to WotC and that is why we have playtests when someone implied that popularity cannot be important if Crawford(?) did not mention it in the interview
For the target audience, McDonalds is good design. I haven't eaten at one in more years than I can remember, but it does what it does well. Good in no way guarantees popularity of course.
I think popularity with your target audience is kind of a given goal of every company and it largely goes without saying.