During the period of fandom in my life that I can remember well one thing has always been true about the Orioles. The starting pitching sucks. The Orioles have by and large failed to develop quality starting pitchers. This has come under multiple regimes at the top and bottom of the organization.
Save for Erik Bedard and Chris Tillman, all other major Orioles starting pitching prospects have flamed out either in the major leagues or in many cases before they even reached the top level.
Most Orioles fans will remember the Cavalry of years past.