Wow Eriny you're either an idiot, or you're a.., not wait yes it's confirmed you are an idiot.
Lets first separate out the two types of university students, those who do proper subjects, and those who are conned into doing 'Arts'.
Now lets look at the former category first:
Several thousand students graduate each year and enter the job market, whether it be in law or finance or science or whatever, and there is a huge information asymmetry problem, firms wants to hire the most intelligent/competent people, but everyone has an incentive to say that their 'the smartest most competent person', thus merely asking them to answer 'tell us why we should hire you' type questions is useless, everyone will lie.
i.e Although the students may know their own level of intelligence/competency, from the point of view of the firms, this information is hidden.
How do student's go about revealing this information? Answer, they use signaling (see Michael Spence (1973). "Job Market Signaling"
http://www.jstor.org/pss/1882010).
Why do you think Hedge funds and investment banks hire Maths and physics PhD's? Hint: it's not because they know anything about financial markets.
(It pretty much boils down to the fact unintelligent peoples cannot accomplish H1's in hard subjects, thus getting a H1 in a hard/proper subject signals that your not an idiot)
The real world evidence strongly supports this view, academic transcript serve as the primary criterion for determining PhD or post grad funding/admissions, (Funding for Masters scholarships at Melb uni is literally determined by ranking students in terms of their grades), likewise, applicants to big companies (Law firms, banks, etc) are automatically listed (the application is usually done online) in order of their grades.
Now, of course, high grades are not a sufficient condition for a successful graduate placement, other hidden information, like 'communication skills' must also be signaled (this is usually done by asking for a photo, fobs will be screened out here ).
Now lets consider the latter category: 'Arts' (think gender studies, social work studies, creative writing, philosophy, Eng Lit, etc).
Oh wait, by the very fact you were conned into taking this stuff signals you are not suitable for a position in which one has to make decisions of any consequence.