a large part of the calculator for these rankings was post graduation success.  Since elite Liberal arts colleges tend to attract kids from extremely wealthy households, they in turn produce kids who have a meh education but have unbelievable connections to get a great job.  I see it all the time, living where i do.  a kid will be encouraged to "follow his passion" and "explore himself" in college.  so he picks a "history of the spanish in america" Major at Colorado College, spends $60,000 per year to pursue this god-awful degree, gets intenships at Morgan Stanley(they want to keep his father as a client), and then a Professional sports team's front office.  Finally graduates after 4+ years, and immediatly has 3-4 interviews at top companys because his parents made some calls.
As long as you arent a fuckup in college, the education really doesnt matter, unless you are going into a technical field. It really is all about who you know, how you develop those relationships, and how good your social skills are thereafter.
But then again, most of the screennames on this site are already aware of this seeing as 95% of this site is in the top 1%.