A balance of simplicity and sophistication. It doesn’t have to be all things to all people; but what it does do, it should do so well that no excuses need be made for why it doesn’t do those things properly.

graceful and gorgeous, timeless styling, not boring. Not ridiculously over-styled. The materials cost the same... the design determines the appeal.

engaging and fun to drive in real world conditions, not just on the track, or beyond the rules and practical limits of real roads. Not huge amounts of power that can only cause trouble with traction, not deficits of torque that cause the car to have to be redlined at all times and driven ridiculously.

Not too small for comfortable grand touring by people over 6' tall, but not a huge land yacht. There is a “goldilocks zone.”

Affordability. Real people should be able to consider buying this vehicle. That doesn’t mean CHEAP, that means affordable.

Reliability. Again, it should do it’s job well, and consistently.

Innovation: If a car can do this while being future focused, such as a mid-engined PHEV, then all the better.

Think of an original Lotus Evora with a HOTTER PHEV drivetrain than a Prius variant, built with Toyota economies of scale and quality control, not Lotus low-volume, high-overhead business costs, with BMW i8-like hybrid performance, without the luxury markup, or the expensive Carbon Monocoque.

Such a car could be the new mainstream hotness, the way Mustang was in the 1960s, Nissan Z was in the 1970s, LOTS of cars were in the 1980s, including the Fiero and MR2, before the death of most affordable sport coupes in the late 1990s, and turbo-AWD high-capability cars like the WRX/Lancer Evo in the 2000s. Something new, compelling, and something that brings appeal down out of the stratosphere, down to mainstream ground level.

Now Sedans are dying by not being practical enough, because CUVs are plenty practical, and efficient (if it can haul more than a sedan, and save a repeat multi-mile trip, or haul enough people in one vehicle, rather than two vehicles, it more than makes up for an MPG or two less on each of those miles..) 

It is leaving non-CUV cars to be less focused on being practical cargo and people boxes on wheels, even if it can innovate on power-efficiency and energy efficiency by using the best features of electric drive’s torque, and fuel-fed range and on-board energy generation, not constrained by the limitations of the batteries.