I could ramble for a while about this topic, but i'll keep it short:
Basically, as long as the music they make is good, then I don't really care how they look. There is a hierarchy present here:
On Top: Good Music, Good Image
Second(but I stress, VERY VERY shortly behind): Good Music, Bad Image
Third(much much bigger jump from 2 to 3 than 1 to 2)-Bad Music, Good Image
Fourth(i piss on this)-Bad Music, Bad Image
obviously, the "Black Metal Image" does not work for all bands (WoY being a good example), thus "good image" does not so much mean "corpsepaint, leather and spikes" as it means "whatever fits the band."
WoY would look rediculous in corpsepaint, leather and spikes, just as Immortal or Dark Funeral wouldn't be as entertaining without those same things.
so i guess i went on longer then i wanted too, but i could have kept going for a page or three.