FSN chimes in:
Running defense: B-minus
The Gophers gave up 124 rushing yards Saturday to Northwestern, the third-most they've allowed this season after surrendering just 68 yards to San Jose State and 83 rushing yards against Michigan. The majority of the Wildcats' rushing yards came via freshman running back Justin Jackson, who had 106 yards on 23 carries (4.6 yards per carry). Jackson never truly broke free, though, for a big gain. His longest carry went for only 12 yards, but he had a few eight-yard runs in which he escaped traffic to pick up a few extra yards after the initial hit.
Outside of Jackson, though, Northwestern didn't do anything on the ground. Treyvon Green had just 16 yards on four carries, and Warren Long and Solomon Vault each had one carry for just five total yards.
Passing defense: B
Minnesota's secondary was tested plenty, as Northwestern quarterback Trevor Siemian attempted 50 passes in Saturday's game. He completed 32 for 269 yards and a touchdown, but the Gophers did sack him twice.
While Siemian had plenty of completions, not many of them went for big yards. His longest pass of the day was just 21 yards to running back Justin Jackson. The Wildcats used the short-yardage passes effectively, but Minnesota's defense did a good job of not allowing Northwestern to make any big plays through the air.
Cornerback Jalen Myrick made a nice play on a ball in the end zone, and fellow cornerback Eric Murray held his ground despite being thrown at often. Safety Damarius Travis had the Gophers' only interception, and it came on the last play of the game on a Hail Mary attempt by Siemian. While the Wildcats' passing game was mostly effective, it never truly hurt Minnesota.
http://www.foxsports.com/north/story/gophers-report-card-strong-return-after-bye-week-101214
Go Gophers!!