Preston: Better offensive linemen? Better evaluations

The Ravens have talked about adding some offensive linemen during the draft, but they need to improve their evaluations.

Since head coach John Harbaugh joined the Ravens, the team hasn't fared well as far as selecting offensive linemen.

In 2008, they selected UTEP offensive tackle Oniel Cousins in the third round. He is no longer with the team.

In 2009, they selected Mississippi offensive tackle Michael Oher in the first round. Oher has been solid, but not the dominant type or even the starting left offensive tackle the Ravens expected.

In 2010, the Ravens took Morehouse tackle Ramon Harewood in the sixth round, and he has been injury prone.

Last year, the Ravens took Central Florida tackle Jah Reid in the third round. Initially, the Ravens talked about him being a starter. Instead, he appears to be a project and the Ravens have him tabbed as a guard now.

If the Ravens are going to select offensive linemen, they have to improve. They had two good choices in 2007 in guards Ben Grubbs and Marshal Yanda, but they have been far from stellar during the last decade.