Roethlisberger was described as "the best pure passer in the country" coming out of college. And his stats: 65.3% completions, 76 TD, 34 INT in 1236 attempts, still far better than McNown, though not as good as Leinart. He was also 13-1 in his senior season, including a bowl win over Louisville, with the only loss coming in the first game to Iowa, which was 10-3 that year and beat Florida in the Outback Bowl. Roethlisberger both had good stats and was a winner in college.
Cutler, on the other hand, managed to lose six of his last seven games, including a loss to powerhouse Middle Tennessee State (4-7 on the year, with wins over Florida Atlantic, Arkansas State, and Troy). He had 57.2% completions, 59 TD and 36 INTs in his career. That looks a lot more like McNown than Leinart does.