Seems to me that there are two reasons PP fares so well as a brand: first, it makes great watches, and second, so many people whose views Happy WIS cares about -- other WISs, happy or not -- accept the conventional wisdom that PP is the "best" watchmaker. Suspend that conventional wisdom, and you'd just be judging individual models on their individual merits, and you wouldn't be making sweeping generalizations about the superior heritage, romance, etc. of one luxury brand over another. (Such debates are akin, in my country, to the silly arguments Harvard and Yale students make about why their particular university is better than the other.)
Also, Edwin's just right about this one: Patek makes many fine models, and its Calatrava line is sublime, but this particular model, the 5565, seems fairly unexceptional to me, at least by Patek or Lange standards.