Here is the report card for the 49ers' defense and special team in their 29-3 loss to the Seahawks:
Defensive Line: F
The Seahawks running game was very effective even though Marshawn Lynch failed to reach 100 yards and was below average in carries. They couldn't stop backup RB Robert Turbin and holes were open for Lynch to run. The loss of Ian Williams in the first quarter proved to be a major loss for the game.
Patrick Willis and NaVorro Bowman tackled well and coverage wasn't as bad as Zach Miller did little. Overall, the run defense still had its holes. There were boneheaded penalties by Ahmad Brooks and Aldon Smith that eventually led to a Seahawks touchdown.
Russell Wilson was only held to 142 passing yards, but some of the throws ended up being back breaking. Nnamdi Asomugha was flagged for a pass interference while Donte Whitner allowed a 51-yard reception by Doug Baldwin on third down. Carlos Rogers also had a share of penalties in the secondary, but Tarell Brown didn't allow much. Eric Reid recorded his second career interception, but unfortunately suffered a concussion when making a tackle.
Special Teams: C
Andy Lee averaged 49 yards per punt while Phil Dawson made his only field goal attempt from 21 yards. Craig Dahl also blocked a punt thanks to some miscommunication from the Seahawks on the snap. However, they did allow a longer punt return from Goldon Tate. Perrish Cox also fumbled off a kickoff near the end of the game.
While it wasn't a great game defensively, it wasn't the primary reason the 49ers lost. The turnovers by Colin Kaepernick gave the Seahawks a short field several times and made it easier to score points. The run stopping was big negative from this game as Lynch and Turbin had their ways with the defense. They did well against Russell Wilson for the most part, but couldn't contain him whenever he wanted to run.