Realistically, Metallica is in a league of their own. They cover so much ground in their discography. Anybody who says otherwise is just a "metal" fan who can't appreciate anything else. Metallica are incredible songwriters. They did angry thrash, then went into their melodic metal, straight into mainstream pop metal, hit us with some country/twang/metal, symphony metal, some awesome covers, one down period where they tried to be nu metal, and then hit us with another solid pop metal cd.
Not to take anything away from the other guys, I love them all, (except Mustaines voice) and Slayer is the best live band ever, but WTF did they do? Release the same cd for 20 years?
...zackley.