Geezer's bass on 13 is also amazing. How it stands out, how fat it is, and of course how great the playing is. The loudness war didn't hurt that album nearly as bad as other Rick Rubin albums (Death Magnetic anyone?).
Since Im getting more into bass, Ive really grown to appreciate Geezer more. And I love interviews with him. Bassist in such a "dark" band but he's like such a proper British Gent.