My impression of Warhammer is that the humour comes from ridiculous levels of carnage and destruction.
Such as in one of the novellas later in the Vampire: Genevieve volume, in which the hard-nosed watchman Filthy Harald snorts demon dust and spends a night beating the hell out of a street full of cutthroats and low-lives. Without asking them any questions. Just to soften them up for later when he will.
I dunno, this is also the world of Trial by Cake and Lord Chicken of Stirland (and, well, the orcs), so some silliness is to be expected. Can't say I endorse this blantant commercialism, but that helm looks pretty pimp. Some more Kislev-stuff in the game would be cool.
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