Now i play the guitar i can usually tell if a band is talented. I wouldnt say korn are crap. They are definatly better than a lot of other new metal bands.
By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.