They gave up over 250 passing yards per game and 136 rushing yards per game last season, good enough (or bad enough) for 27th in the NFL in both categories.
That being said, their defense will not be anywhere near as bad in 2012.
They were hit with a rash of injuries to key players and, to be honest, they ran a defensive scheme that just wasn't right for their personnel.
With the addition of Dennis Allen as the Raiders new head coach, the defense will certainly improve.
Allen was the Denver Broncos defensive coordinator last season and while Tim Tebow got all the hype, it was Denver's defense that kept them in games and led them to a playoff berth (via CBS Sports).
Here are six Oakland players who will thrive in the Raiders new defensive scheme in 2012.
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Article Source: Bleacher Report - Oakland Raiders