McClain had been drafted with the hopes that he could help improve the Raiders' run defense, an area where the team had been consistently among the worst in the league. Following a string of poor first round picks by late owner/GM Al Davis, the selection of Rolando McClain was applauded by many analysts. Throughout his tenure however, McClain has not only failed to help bolster the defense against the run, but he has also shown to be a liability in pass coverage
http://en.wikipedia.org/wiki/Rolando_McClain
During the 2012 NFL season, in which the Raiders' defense struggled and was statistically the worst defense in the league, McClain saw his playing time decrease following a 37-6 rout by the division rival Denver Broncos. During a week 4 game against Denver, McClain played in 73 snaps, but following the bye, the Raiders made the decision to replace him with 4th round rookie Miles Burris in their nickel package, resulting in McClain playing only 17 snaps compared to Burris' 55 in the week 6 game against the Atlanta FalconsHead coach Dennis Allen was quoted as saying that he has been impressed with Burris' ability to make corrections on the fly, saying the linebacker was not a "repeat offender" when it came to mistakes and a smart football player overall, indicating the coaching staff's belief that McClain was guilty of poor decision-making and too many erro