Well, I will dispute it - you are full of crap. You use dishonest statistics to support your erroneous conclusion, which is not good. The real statistics (as supported by the year-by-year breakdowns of CollegeFootballDataWarehouse) are as follows.
In reviewing these stats, wins or losses by seven points or less are really the best barometer, because 7 points is a margin that can be closed in one drive. For example, Iowa has had several overtime wins that were decided by 7 points. You can't have a game closer than one that goes to overtime. Here are the real statistics for the entire Iowa coaching career of Kirk Ferentz
5 pt or less 7 pt or less
1999 0-2 0-4
2000 2-1 2-3
2001 0-2 2-4
2002 2-1 3-1
2003 1-0 2-0
2004 4-0 5-0
2005 0-2 0-3
2006 0-3 1-3
2007 2-2 3-2
2008 2-4 2-4
2009 4-1 4-2
2010 1-4 1-4
Overall, in games decided by 7 pts or less, Ferentz is 25-30. In games decided by 5 pts or less, he is 18-22.
Since 2005, he is 11-18 and 9-16, respectively.
His career record of 25-30 in games of 7 pts or less is ok, but not great.
Since 2005 he is 11-18, which I would say is a poor record.