It is relatively easier to acquire quality O-Line talent later in the draft or via free agency than trying the same approach to nab a quality CB, edge rusher or other "playmaker". The only exception is left tackle, which we wisely addressed last season
Case in point: Yanda, 3rd rounder; Wagner, 5th, Jah Reid, 3rd (hey, he starts for KC), Jason Brown, 4th.
What's really killed us is the over-investment in failed defensive players, especially at LB and safety. I know that many of these guys are also targeted as special teams players, but the likes of Elam, Brooks, Arthur Brown and John Simon haven't helped us (though Simon has helped the Texans)