The argument people have against shred, and I think that it's often a valid one, is that the music becomes eclipsed by the technique required to produce the music. The best example of this that comes to mind is Frank Gambale. Much of music is dictated by sweep picking. He basically invented the technique, got very good at it, and then played sweep licks just because he could, not really because they fit musically, or because they were interesting melodies.
The point should be to make music. As long as the notes being played are being played for musical reasons, rather than to show technique, then the intentions are correct. Charlie Parker played very fast, and played lots of notes, but he was never boring; it was always phrased musically, and his lines always made musical sense.