The real problem is that Ginn is not a real football player.
Ohio State converted a track athlete into a kick/punt returner and Wide Receiver.
He's not tough, he can't break tackles, he has horrible hands, he can't jump in the air and make acrobatic catches, he has poor vision when running with the ball....
The only thing he is good at is running down the field and hoping he burned the defense, which will not happen every often in the NFL like it did in college.
Here is his wikipedia page :
OSU track coach Russ Rogers recruited Ginn to run track,
believing that he could qualify for the 2008 Olympics.
However, his track career was put on hold in order to focus on football. Ginn was recruited as a defensive back by Ohio State.