While I do agree with you that Hypocrisy is really in their own genre, I think they still need to be considered melodic death, because they can be compared to other melodic death bands like amon amarth, unmoored, and even wintersun. I hear traces of Hypocrisy in all these bands, and they're all considered melodic death. Of course there are many other "melodeath" bands that dont sound a thing like Hypocrisy and these are generally the "gothenberg" bands, such as In Flames, Dark Tranquillity, and Nightrage. Personally I dont consider the gothenberg style to be death metal at all, it all sounds like metalcore to me, particulary because of the vocals. People often think that just because a band is from Sweden that they are a "gothenberg" band but that is definatly not true. Also funeral doom is considered a subgenre of extreme doom.