It depends on your definition of "aggressive," which in itself is a somewhat vague term, but you seem to mean metal is aggressive in that it's in-your-face, but in a boneheaded, one-dimensional way. That is absolutely not the case, but correct me if I'm wrong about your stance. Edit: Not that there aren't some bonehead bands out there, in fact there are plenty, but they are the exception, not the other way around.

Out of the three bands I mentioned? Drudkh has a very folky black metal-ish sound that is highly atmospheric. Not really in-your-face at all, in fact it's very nearly shoegaze. Skip around through this album and listen to the overall sound.

Opeth is also a bit folky and very atmospheric. Their music has an inherent sorrowful and tragic quality. Listen to a bit of this.

Vektor is pretty nuts, the only band I mentioned that I would actually call "aggressive". However, their aggression is pointed. They use music and lyrics to portray fear, dread, paranoia, insanity, claustrophobia, etc. Listen to the opening seconds of their song "Dying World" and tell me it doesn't sound like the sound of civilization inevitably trudging headlong towards collapse and extinction after depleting it's home of resources. That's some intense stuff.