A good punter is very valuable. For example, last year with Cunningham and Colquitt. Lets say Cunningham averaged 35 yards a punt. Well Colquitt comes in and averages 45. That is 10 more yards that the O will have to gain. The statistics go way down the furthur you have to drive the ball. Football is a game of inches, and 10 yards can help you out.
PS. The Miami game where DColquitt kicked that perfect punt. Some say he won that game for us.
A good punter is very underrated. They dont play the bigget role, but they are vital to a good team.