Interesting,those look monumental,and would make the viewer feel small and insignificant, in comparison. But I would say it's in much the same way as a big slabby prison or cop house would.*
They would be intimidating to view, but not in a particularly other-worldly way, not in the way that art deco might.
I'd suggest this is true of fascist /Nazi aesthetics in general.
They basically ripped off what they could from the esoteric, and made it exoteric.
I suppose the counter-argument would be art deco ripped off the esoteric too, but in the service of consumerism.
I guess it's just a matter of opinion what survives after being recuperated.
*Pic-related MI6 building in Vauxhall, London,is an exception, and has more of a deco look to it. But I would argue it's the exception that proves the rule; a deliberate attempt to lull the public .