My psychiatrist's take on it is that personality disorder is as good a name for them as any, because everyone has aspects of all of the "morbid" symptoms as part of his/her personality, and can at times display them. He says that it is only when a few of the unhealthy traits come to dominate a person's life & thought patterns, and affect his or her interactions with external reality, that it becomes a "disorder".
Having said that, the lovely man doedn't think labels are particularly important or helpful, other than as a kind of shorthand for a set of symptoms. Bless him