Compare "Dalek" to "Journey's End".
The single Dalek absorbed the entire Internet and was powerful enough to potentially take over the country and then the world.
The huge army that Davros created merely hovered around their spaceships and then got blown to pieces by a few buttons on their own control panel.
Loads of Daleks doesn't work because it's likely they'll all be conveniently killed off or beaten by the end. Whereas it's a little less predictable and edgy with a small group of the buggers.
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