Yesterday's Financial Times carried a polemical piece by Nassim Taleb. In it he derided the use of mathematical models and called the so-called Nobel Prize for Economics an absurdity.
While we ploughed our way through a fair share of mathematics in our undergraduate economic classes and found them pretty remote from reality, we would not go so far as to completely reject the role of mathematics in the financial markets. At that time it was a sign of stellar quant ability if a bond trader or salesman could calculate the yield to maturity on a bond without use of a calculator, but time has moved on.
The recent events in the credit markets, however, have demonstrated that at PhD in Maths cannot be a substitute for good judgement and that good character should still be the basis for a successful career and business.