I listen to a lot of metal, but only the melodic variants. My preferred genre is gothic metal (the early Theatre of Tragedy, The sins of the beloved, After forever, Epica, Within Temptation's first album...), heavy metal, melodic doom, melodic black, power metal (and it's variants: symphonic, epic, hollywood -Rhapsody
-...) and some melodic death (like Children of Bodom, Eternal tears of sorrow or Dark Tranquility).
I have tried two closed backs that are good for metal, the Beyer DT 150 and the Denon AH-D9200s. Regarding to the Beyers they do most types of metal very good, but lack something, maybe they sound so correct and don't emphasize anything (a little the bass) -they are studio headphones- and at the end they are a little sterile. On the other hand, I love the AH-D9200s but not for all the metal genres I listen to, they shine with heavy metal and melodic death and work very good with Power metal.
My most versatile headphones for metal genre (althought semi-closed) are the Beyer DT 1990 Pro. Today, I have been enjoying them a lot with this genre. I've listened to some Nightwish albums, "Noumena - Myrrys" (I think that was
@Chris Kaoss which introduced me to this band
and after that I will go with an album that I've recently adquired and I love: "My Dying Bride - The ghost of Orion" that I know sound spectacular with them.