A psychology prof once told us that the DSM isn't a diagnostic manual or any sort of medical text -- it's just a reference book so the insurance industry knows how to bill psychological conditions.
Also, while I agree the mis-dignosis is common and many of the elements read like a horoscope/fortune cookie, you can't say that Nite Owl II was a narcissist or that Ozymandius had avoidant personality disorder.
Perhaps his professor _was_ accurately describing how the profession as a whole uses the manual.
You can diagnosis pretty much anyone with narcissism.
For those listed in the article, here's my winning score for presence of traits that I'm known to have IRL.
The ICD-10 requires at least 4 of the following for an SPD diagnosis: 1 Emotional coldness, detachment or reduced affect. 2 Limited capacity to express either positive or negative emotions towards others. 3 Consistent preference for solitary activities. 4 Very few, if any, close friends or relationships, and a lack of desire for such. 5 Taking pleasure in few, if any, activities. 6 Indifference to social norms and conventions. 7 Preoccupation with fantasy and introspection.
The ICD-10 requires at least four of the following for an AvPD diagnosis: 1 Persistent and pervasive feelings of tension and apprehension. 2 Belief that one is socially inept, personally unappealing, or inferior to others. 3 Excessive preoccupation with being criticized or rejected in social situations. 4 Unwillingness to become involved with people unless certain of being liked. 5 Restrictions in lifestyle because of need to have physical security.
The ICD-10 requires at least 3 of the following for an APSD diagnosis: 1 Gross and persistent attitude of irresponsibility and disregard for social norms, rules, and obligations. 2 Incapacity to experience guilt or to profit from experience, particularly punishment. 3 Markedly prone to blame others or to offer plausible rationalizations for the behaviour that has brought the person into conflict with society.
I'm 1 short on the others except histrionic personality disorder, which I'm at least satisfied I had a zero on.
Specifically, one big glaring criteria that most people don't meet is "C. The enduring pattern leads to clinically significant distress or impairment in social, occupational, or other important areas of functioning."
Personally I'd say that if your particular behavioral patterns lead to costumed vigilante crime fighting you probably meet criteria C.