I don't understand how they can say this class is the most 'dark'. All I can think about when I see it is emos (all show and nothing to back it up). The Barbarian is a darker class surely? How about the Witch Doctor? You don't need dark spell effects to be a dark character, you need strong characteristics. The WD sacrifices pets without any hesitation. The Barbarian has (hopefully) seen all the events of D2 unfold, and still has demon-blood lust after all these years.
Honestly I think the male DH looks worse than the female. However the fact a lot of people like it I suppose means I can't really complain. Sigh.