Scumbag I would suggest that Fatal Nostalgia bring to post-metal what My Dying Bride have always brought to doom. They are able to meld beauty and darkness into a single emotion-filled entity for the listener to explore.
I wouldn't go so far as to say that both bands sound alike, however I believe it would be easy for a fan of one to be a fan of both. Awesome stuff!
Favorite track: Moonlit Ascension.