I just find it interesting coming from a evo ( fake carbon fiber hvac surround anyone?) standpoint that you would find the interior lacking compared to a evo's, which by all accounts is one of the biggest "flaws" that was covered in auto reviews of the evo.
The black plastic they use is the same as what you find in the 3g eclipses/stratus and as far as I can tell the evo. I'm not a plastics specialist but as far as I can tell auto plastics usually exhibit the same characteristics, so I'm trying to understand where your coming from with the feeling that they used inferior plastic, how?, why? Is it because the plastic has a matte finish as opposed to a shiny appearance ?
Don't feel singled out, I've heard this about the evo several times from wrx owners and I just don't see how the black plastic in the evo is any different than the black plastic in the wrx, I've owned both and the only difference I've noticed is the wrx has circle airvents where the evo's are rectangular, and the wrx/sti has fancier hvac knobs.
I've seen some very nice interiors when I was a mechanic at the local BMW/Porche/Audi dealership, but the plastic content of the interiors was substancially lower than you find in pretty much any vehicle under $30k.
Exhibit A and B (my evo, and my wifes lancer) bear in mind I replaced the stereo surround with the cf gauge holder.

Note-the far right mismatch gauge has been replaced with a matching aem oil press.