There have been a number of responses that suggest that a comparison of Shanahan to Ozzie Newsome and the folks up in New England would be a better way to evaluate. Asked and answered. Below you will find New England and Baltimore drafts from 2006 - 2008, which is the same period that Shanahan was drafting, in addition to the fact that you need 2-3 years to really evaluate a draft. 

Reminder:
The (+) by the names are guys who turned into legitimate NFL ball players. The (*) represents guys who are at least still in the NFL. 

Again...Bruce Allen drafting terrifies me (http://www.nfl.com/draft/history/fulldraft?teamId=4900&type=team)

New England [2008] = 3 of 3 needs met (1 LB still starting – 2 LB & CB legit players)

Baltimore [2008] = 3 of 4 needs met (2 QB & T still starting – 3 unidentified needs starting, 2 still in NFL)

New England [2008] = 4 of 4 needs met (1 S starting – 7 out of the 8 picks no longer in NFL)

Baltimore [2008] = 1 of 4 needs met (1 LB 2nd String – 4 unidentified needs legit, 3 still in NFL)

New England [2006] = 4 of 6 needs met (1 K still starting – 3 unidentified needs met OL, DL, TE)

Baltimore [2006] = 3 of 4 needs met (1 DB still starting – 3 unidentified needs met DT, OL, P)

 2006 – 2008 Drafts Historically

Belichick: 5 out of 25 guys drafted that are legitimate NFL players

Ozzie:  12 out of 27 guys drafted that are legitimate NFL players

Cerrato: 4 out of 21 guys drafted that are legitimate NFL players

Shanahan: 12 out of 20 guys drafted that are legitimate NFL players