I think there is plenty of room for advancement in that area, like some weird El-P style beats but tougher, with pissed off lyrics that aren't necessarily about killing people, might be good if done right...
As far as Vinnie Paz goes, I kinda like that, it is like a paradox, have you ever heard the remix of "Retaliation" by Jedi Mind, it is like a mellow guitar riff, but the lyrics are kinda brutal, personally I think it works, but everyone is entitled to their own opinion. It kinda seems like he is letting the mellower beats help him release his aggressions or something. Well, whatever...