No, it is overhyped and should not be a headphone recommended for metal at all unless you like torturing your ears with bright treble and non-existent bass. There is no impact from the AD700 at all, it lifeless sounding. Think of the AD700 of a girl suffering from anorexia.
I use my LCD2's for metal as I like the thumping drum and guitar bass paired with the dark signature of LCD2's as it sounds "apocalyptic". But definitely check out Alessandro and Grado series headphones for metal and rock as they are good for these two genres. Start with something like MS2 for Alessandro and SR325 for the Grado's.
But Grado's have harsh treble also?