andromeda - I would agree with kwam, 2009 was an evil year. As one who was a day away from being in the three month unemployed at a school, yet had a job from my summer internship (at one of the biggest companies in the world, that then revoked in the Spring) - a lot of unusual things happened that hadn't since 2001.
Then there is why people are unemployed - I know people who still are, who enjoy some form of luxury that they are waiting out for the job they always wanted. Some are looking in to other things. It might turn out that the 2009 class got themselves into really interesting things as a result of the abnormal way things went.
I would fully expect in a few years time that most the people who want jobs will get them before graduation. There will always be some that don't, and there will be reasons (even Wharton can have some people that it is difficult to recruit).