I think what's most important about music is that it flows naturally - both from the artist's instrument and into the listener's ears.
Autopsy didn't have great instrumental skills and weren't concerned about how their music would be accepted - they just got together and did what they thought was right to do.
When I listen to Origin or Beneath the Massacre, I imagine these straight A+ Berklee graduates going into the studio and thinking about how to make the hardest-to-play songs ever.
This is kind of what Chuck Schuldiner did with his progressive albums - "Yeah, like, let's, like, make something PROGRESSIVE!" Why? "To be progressive and musical, unlike those death metal savages!"
So what are you proving? That metal could be technical and complex? Trying to appeal to the snobbish classical/jazz audience?! What's the point? Being a star?! Fuck stars! I thought an artist's biggest goal was to create something true, something inspiring, something which could one day change somebody's life...
...oh, wait, these people aren't artists. They're rockstars, showing off how cool they are, how progressive and thoughtful they are.
But, at the end of the day, Discharge's three chord punk is more progressive than instrumental wankers like Dream Theater.