I think something a lot of the current crop of music seems to forget is acoustic or "clean" preludes and interludes. The reason for this is probably because the bands think that to look "true" the music has to be either unremittingly raw or "brootal."
Most of the most successful bands have done this. Slayer's "Spill the Blood," "Dead Skin Mask," "South of Heaven." Master of Puppets is full of these. Death, Morbid Angel, Dissection.
Also melodic elements, but "melodic death metal" seems to have gone into a certain stylization. "Melodic" doesn't mean certain scales or texture.
Why is this? I think it may have something to do with ear fatigue. Also, in songs like Dissection's "Unhallowed" the cleaner parts are clear statements of the theme. When the distortion comes in again, the theme is restated in some way, with distorted chords filling in large chunks of the soundscape that were previously empty. The contrast makes the distorted, muted chords seem far heavier and more powerful.
In the best cases, the classical preludes aren't simply tacked onto the front or thrown into the middle, but are integral to the sound-- in the absence of noise, the pure form of the music is revealed momentarily.
I tend to like bands that do this. I tend to dislike bands that don't.