The real quality of a car is expressed in how little time it spends in the repair shop. You are unlikely to be able to figure this out in the showroom, or in a test drive. Problems will only show up after a few months of driving.
The perceived quality of a car is a different story. The sound of a door closing, little rattles. They might have nothing to do with the actual quality of the car, but have a huge impact on how we perceive things.
Car manufacturers spend a lot of time and money on ironing out this little imperfections. Testing, testing, and testing at different speeds, different surfaces. As soon as the tiniest noise is heard, take out the statoscope (the passenger tester), locate the sound source and fix things. (A heavier material, some padding, a different screw).
There is a parallel here for your slide deck. The actual quality of the raw story, and the perceived quality of its presentation.