How about racer x, shadows fall, steve vai's heavier stuff, napalm death, the haunted, at the gates. The last few are the real metal riffage everybody looks at. Metallica used to be good back in the days before most of us were even born! Pantera, Damage Plan anything remotely dimebag darrel (ish), Superjoint Ritual and even ministry and Exodus. What was kirk hammett thinking in the early 80's. Exodus were a far better 'metal' band that metallica