Goombah makes some excellent points. Whereas many college receivers make it easy for their qbs by running away from defenders, in the NFL everyone in the secondary can run. Also the coverages and blitz schemes are far more complex in the NFL than in the best college programs.
One measure that's been helpful in determining what college qbs will find success in the pros is the rule of 26-27-60. A qb, who scores at least a 26 on the Wonderlic, has startes 27 college games as qb, and completed 60% of his passes has a high probability of being a successful pro qb.
That's a good measuring stick, Klydon. However, I think the 27 college starts is not enough of a barometer. Especially with the creampuff schedules so many Division I teams play. It happens much less frequently these days, but most of these QBs need to play at least 3 seasons worth of college games. But even guys like Quinn, Leinhart, Vince Young, and Carson Palmer were blue chippers who have had average to subpar pro careers. They simply benefited from having great talent surrounding them at the collegiate level that was missing in the pros.
