The Prius driver's seat is the "least great" part of the car.

I traded a 1999 Ford Taurus for my '06 Prius and the Prius is superior in every way EXCEPT for the driver's seat. The Ford's seat was more comfortable and also fully electric adjustable.

Of course, if Toyota were to put a better seat in the Prius, that would pretty much make the Prius a nearly perfect car. Scary thought.