I think the D played relatively consistent all year and then really turned in on in the playoffs. They were 3 dropped INTs (Harrison, Samuel and the 'no hands' Merriweather) and a missed sack (Green, Seymour) away from the championship. The defense went 9 straight quarters without allowing a TD, and if.. big if.. they would have stopped the Gints they would have averaged 14 PPG in the playoffs, as it was 17 PPG is still not bad.
Against 4 of the top 7 rushing teams the Patriots held each team below their seasonal rushing average (the defense was not pushed around)
- Jacksonville - season average - 149 YPG, against the Pats 80 yards (also under their PPG average by 5)
- SD - season average 127 YPG, against the Pats 104 (also under their PPG average by 13)
- Giants - season average 134 YPG, against the Pats 91 (also under their PPG average by 6)
The offensive line was over matched, the QB was gimpy and they Patriots offense was outcoached by the Giants. The offense was 22 points below its season average.
At the end of it they were a play (or playmaker) away from the greatest season in NFL history.
Time to shift gears, the defense played to its maximum potential last year. They were flawed, the lack of speed at ILB put a lot of pressure on the Safeties who had to try and play the deep part of the field as well as cover the middle because the aged could not get deep enough drops. Vrabel was banged up and without his consistent pressure opponents had the necessary time to complete passes.
What is the answer you ask? Not a complete overhual but some tweaking, I fully expect the scheme to stay virtually in tact, a bit more speed will be added to the LB core hopefully with an improved pass rush, at the end of the day the defense will be top 7 in the NFL and if they make enough plays in the playoffs have a very good shot at a title.