How about plain old 'bad styling' or possibly worse, 'functional styling'?
The original Beetle was styled for the functionality of that car, and with Third Reich artistic standards.
The Citroen 2CV the same, minus the Third Reich artistic constraints.
Many more examples up to the time of those you've mentioned; again, styled for the function only.
And my favourite for sheer ugliness, The Aztek. Had to pass one at my corner -- a bright yellow brick -- for many months, and frequently had to answer the question, "What in hell is /that/ monstrosity?" It too was styled for it's function.
People these days drive more 'vehicles' than 'cars', and the vehicles generally have the artistic appeal of any military vehicle. And the cars have been homogenized to aesthetically offend nobody, with the side-effect of pleasing very few. Which is why a typical highway today looks like a mass of military maneuvers mixed with mostly undifferentiateable little buglets milling around like bees in a hive or ants in a hill.
No, there isn't. There's "deliberately styled to look as if it was just an industrial produce", but trust me -- just as much money went into the styling of a Scion XB as a Mazda RX-8.
Piero Drago had little money but designed a car which introduced many new design features. It's at the opposite end of the scale as the most desired car of all time, the 1967 Ferrari 330 P4. Probably a lot more money went into the "style" of cars which no one wants.
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