McBean had a very solid 2011 season with four sacks from his nose tackle position as a regular in their defensive line rotation.
The downside here is that McBean is going to be suspended for six games after violating the NFL's performance-enhancement policy. McBean is likely to appeal the suspension.
This isn't a major signing, but McBean, when he comes back from his suspension, could provide a solid presence as a backup defensive tackle who could play behind Terrence Cody and Haloti Ngata.
With the additions of McBean and Kemoeatu, the Ravens have a talented group of nose tackles after coming out of the draft thin at the position.
McBean and Kemoeatu will compete with undrafted rookie free agents Nick Jean-Baptiste and Ishmaa'ily Kitchen to become part of the rotation at nose tackle.
Kemoeatu could have the leg up in the competition because of his familiarity with the organization, but don't count out McBean or Kitchen, who Eric DeCosta referred to as "a nose tackle from the MAC that we're very excited about" in a ravens.com chat.
The Ravens will be hoping that McBean's suspension gets reduced, but either way, they've succeeded in turning a position of weakness into a position of strength in these past few days.