Epic means that the lyrics have fantasy influences, very tolkien-ish. Type-O lyrics are sometimes very depressing, wich sound like doom to me. Offcourse it's also has gothic influences.
Bah, nobody cares what genre it is, just if you enjoy it or not.
Doom metal is Anathema. Ask any Goth about Type O' Negative and they'll tell you that Type O'Negative is goth.
If you start looking which band is epic and which is not, Iron Maiden, Cradle of Filth, Dark Tranquility, Finntroll, Sonata Arctica, Rhapsody, Blind Guardian and a million and a half powermetal bands will be in the same cathegory.
I wouldn't say that Nightwish has much in common with Cradle of Filth.
