This, obviously, is a matter of value judgement.
Narcissism is a powerful force, akin to the psychological element in drug addiction.
The narcissist is sustained by ever increasing amounts of Narcissistic Supply. Depending on how talented the narcissist is, Narcissistic Supply could be the by-product of real achievements. A narcissist will, usually, apply his skills and exploit his natural advantages where they would provide him with the highest narcissistic rewards. Still, narcissists are, mostly, gifted and, therefore, are able to contribute to society at large. It takes a major life crisis to force the narcissist to face his false self.