I did my undergraduate work at BU, then coursework for my MBA at another private, nationally ranked, Midwestern university that was a "research" institution.
The difference was night and day.
BU tends to have faculty with practical, real-world experience that share those experiences with students. Very valuable, IMO.
The other university, which typifies many other research-driven universities, was stocked with faculty who had very little, if any, experience outside of the classroom. Their "knowledge" was extrapolation from observation -- but not actual work in the business world. It was all theoretical, which has value, but that value certainly didn't equal the cost of the program...besides, I learned the theory as an undergraduate
Essentially, BU taught me every concept and theory that was taught at the MBA level at this particular institution, but in a more practical way, again, IMO. I felt as though I was paying for some letters to put behind my name because I wasn't gaining any insight or knowledge that I didn't receive at BU. Although I did make some nice contacts.
I suppose my point (admittedly bias) is that BU and similar schools provide an extremely valuable education for their students, one where the knowledge immediately can be applied to a first job and beyond. Research-based institutions tend to value grant dollars more than classroom teaching and provide a wildly different educational experience for their students.
You certainly can receive a good education at many schools, but after experiencing for myself the style of a research school, I can assuredly say that I wouldn't trade the knowledge and practical training I received at BU.
Different strokes for different folks, I suppose.
While I also consider the methodology questionable for this particular listing, I have no doubt that BU offers an education that should rank among the nation's best - albeit markedly different from many others on the list.