Let’s cut to the chase – what distinguishes ‘real’ driver’s cars from grocery getters boils down to where the engine is placed and where the torque is sent (the closer to the center and the more to the rear respectively, the more agile the final product).
The Mercedes A class was ingenious in its placing the engine below the floor but the more you loaded it up the more likely it was to go belly up. Later cars were stiffenened to the point that they rode like sports cars but didn’t handle all that much better.
The Smart conversely showed the world the minimal power – when combined with minimal weight – could be maximal fun. In fact Gordon Murray, designed of the vaunted McLaren F1, loves the ForTwo, especially in Brabus form, where the front tires are widened and the torque curve is fattened.
All that said, I’d like to see efficient cars of the future to follow a mid or rear engine, rear drive or rear biased all wheel drive layout similar to the Mitsubishi i. With the advent of ESP and traction control there’s really no point in front engined, front drive cars (that is unless you’re a carmarker – they love the design because it reduces assembly time and maximizes profits).