I think it was Audi, with the "original" 100, that got folks thinking/talking about aerodynamics (again?). That car had a cd in the low .33 area....a number the original Taurus bested. There have been many cars that looked like "bricks" that had low cd numbers....but just as important as cd is the total frontal area. That's why the original Honda Insight, the 1st gen. Prius, and most Porsches, are very aerodynamic and in the case of the Japanese cars mentioned need very few horsepower to get them moving and keep them moving.
BUT, the really short answer? E-30s LOOK like bricks, and if you get one with a 4 cylinder or the eta engine, and automatic transmission...it will move like a brick.