Fortune places a 65% weight in its new ranking on staring salary and placement, far more than the Financial Times, Businessweek, U.S. News or The Economist. What's more, its definition of pay only includes base salaries of last year's graduating class. Some other rankings include sign-on bonuses, the percentage of grads who get a bonus, plus alumni pay. The emphasis Fortune is putting on starting salaries leads to some odd results.