I will compare it to 4 interiors that I am very familiar with.
93 3000gt vr4, 93 Audi S4, 2000 Audi S4, 03 Escalade
Lets take the 2 1993 cars. I can push anywhere on the dash, radio, arm rests...anywhere in the interior and I will not feel cheap ass plastic anywhere, and I will also not get that hollow, creeky plastic noise when I push on it. The 3000GT being a sports car, it had much better ergonomics than the C5 vette did which is also a sports car. Things are designed to wrap around the driver, not just thrown in there and arranged in some random way, which is my problem with 99% of American cars. Pretty shameful that cars so much holder are holding up so much better.
2000 S4 I think has one of the best interiors, everything is in the right place, everything is solid, everything feels nice to the touch, no creeks, squeeks, no hard cheap plastic, no fading trim pieces. In a GM the paint starts coming off the radio and other high wear areas.
03 escalade is close to the vette interior. You get in and you get that impression that you are in a nice interior. Then you start driving or touching things. Knock on the dash and its that cheap ass squeeky plastic. The radio buttons used to say "1, 2, 3, 4", now it says "[green light shining through plastic], 2, half a 3, black". They throw leather in different places here an there, which helps but its just to distract you from the cheapness.
But see its ok, because you did not buy a vette for a nice interior. But in a Cadillac, you are paying more to have a nice interior, but instead you are getting the chevy interior with a couple of leather patches.