I used to listen to a shit load of Metal, near the only stuff i did listen to.
Then i slapped my shit together, realised a lot of it was cheesy as FUCK and zoned in on a lot of the other genres i listened to.
I follow the philosophy that if it's got a guitar i'll listen to it seeing as my music mainly comprises of [hard]rock now but there's some indie rock, 3rd wave ska, reggae, electronic, acoustic, prog, stoner rock/metal, punk, hardcore, pop, pop punk, instrumental, rap, hip hop and still some remenants of metal in there aswell.
I figure you just got to have it in your library because you're always feeling for something different at different times.
From experience obsessive metal fans just need to get their heads out of their arses and appreciate some other fine works of art.