7. Haloti Ngata (Ravens)
The Pro Bowl defensive tackle would probably be ranked even higher if not for the nagging shoulder and knee problems that plagued his 2012 season. Nonetheless, he's still a menace on the interior, providing constant push that ruins running plays and makes quarterbacks uncomfortable. (AP Photo/Keith Srakocic, File)
The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.