It seems the debate has become really heated. It is true that Wisconsin gets more paper published in the top journals, and I also admit that they are of "high quality". Yet "high quality" does not necessarily imply "intellectual". One fact I want to point out that the reason Wisconsin gets more paper published is simply because they own the largest database in the Unites States, and perhaps the largest university-run in the world. That is to say, they have a powerful paper engine, which is a huge plus in paper counting. My undergrad adviser comes from Wisconsin, and he told me that if one goes to Wisconsin, professors will say "Hey, here is some data, just take them and make your dissertation out of it."
This is not a bias against quantitative works. But simply to point out that the fact that more journal articles are read, cites, and regarded most influential may be contingent upon what sort of study to which these papers are related. With the huge plus of databases, one can produce multiple papers when others may only be able to produce one, collecting data on themselves, or doing archival research instead. Yet it would be unfair just to count numbers without treating different things differently. As for "intellectual contribution" Harvard had Talcott Parsons, Barington Moore, and produced Charles Tilly and Theda Skocpol. Yes, Wisconsin has many rigorous, respectable and highly productive social scientists, but could you name some influential intellectuals from Wisconsin?