In short, it matters. This should not come as a surprise to anyone.
First, this is a chart of the average W/L record for all teams from 2007-2012. As always, higher in the chart and further to the right is better. The colors indicate a team's season win/loss percentage (red is bad, green is good).
Clearly there is a strong relationship between offensive and defensive point-drive efficiency ratings and final win loss records.
2013 Week 4 Drive-Point Efficiency Ratings