How common is it for a person to have a college degree and go into the Army or Marines as enlisted?

People apparently in the know tell me that, going "mustang" or "maverick" and NOT trying to go the OCS route (uming I want to be an officer and have the chops etc.) is a terrible idea, and I'd generally agree. Then I hear other people tell me that an overwhelming amount of jobs that are open for officers, if you go to OCS, require that you were previously a civil servant, so it's better to enlist. Also, I'm not talking about people who go in with no college enlisted and then go to school while they serve, that's not my situation, I already have a degree. I don't care about Navy or Air Force either, just Army and Marines (haha save your comments about that for another question.) Thanks