I have to admit i am abit indifferent to this genre, or should i rather say; this self-imposed restriction in diversity of moods/emotion channeled through a band's music.
Even though one of the bands I have played in (Implacable), have been diagnosed as funeral death/doom, and there definitely are some gems in the genre (Ahab and Funeral in particular), in general I find that the product of a band that sits down and intentionally produce something as narrow as "funeral doom" more often than not ends up as somewhat dull and repetitive.
This is naturally very subjective, but I have tried to get into bands like Skepticism, Swallow the Sun & Shape of Despair, and I simply can't seem to "get" it. I tried to force feed myself with "Farmakon" when it came out, to no avail. Even though I by all means were in the "optimal" receptive mindset for this kind of music at the time, depressed and suicidal. But I honestly find more diverse bands like Anathema or even Pink Floyd far better at expressing and stirring these emotions that funeral doom "specializes" on; bleakness, hopelessness, despair, sadness...
The above is of course a bit of a general "rant" against too narrowly defined musical genres of expression, but for some reason or other I find that issue more pressing and actual when it comes to "funeral doom" than most other genres. (Probably because my own expression is somewhat bordering on and overlapping this area)