Another issue is that the figures don't add up.
The M7 are defined, so no problem there, but then you have:
- About 15 schools claiming to be top 10 (the M7 plus most of the elites).
- About 30 schools claiming to be top 20.
- About 40 - 50 schools claiming to be top 30.
- About 80 - 100 schools claiming to be top 50.
And it goes further with European schools. Since they don't have to live with a precise number and since they usually claim to be international, most schools in Europe will claim: Top international school in [insert European city here]. While the statement would be appropriate for a handful of schools, the number of schools claiming the status can be as high as 50.
But my personal favorite is ISB. In the marketing materials they sent me, they claimed: top 10 school worldwide in average GMAT (or something similar) and went on comparing ISB (if I recall correctly) to Kellogg and Wharton, based on nothing more than the average GMAT.
Note: The above is based on marketing materials I got from the schools, stuff I read at boards and my biased perception. I do not intend to mock any organization or offend anyone, I'm just commenting on the marketing spin to which schools usually resort.
L.