Ranking the top schools is an imperfect science...in fact I think it is as much art as science. I think it is a combination of reputation, alumni network, endowment, academic profile of students. Not all of these things can be objectively quantified.
The US News rankings are fun, and schools sure are happy when they get highly ranked. But for a back-of-the-envelope ranking system, I like to refer to the following website, which lists SAT and ACT scores for the 25-75 percentile of each school's enrolled students. Again, this is not definitive...and it says nothing about reputation and alumni network. But at least it is an objective, apples-to-apples comparison
The thing is reputation and alumni network are significant factors. My daughter interned at a large, prestigious law firm the past two years. When she was accepted to a highly regarded law school she was told there would be a job waiting for her if she graduated in the top third. When she was accepted to an Ivy she was told just graduate.