I was wondering if the majority of those who consider Dimmu to be poor excuses for dark music are familliar with 'Puritanical Euphoric Misanthropia'?
I mention this because that guy on the first page listed some tracks that he likes, all of which were from previous albums (I couldn't be bothered going back and quoting him).
I find earlier Dimmu Borgir rather enjoyable, but I find P.E.M absolutely amazing. It's like a completely different band, and I hope those who are outspoken against them check out some of those tracks (my apologies to those who already have

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As for categorisation, I do tend to consider them black metal, if in the symphonic vein only. Of course they are nothing like Darkthrone and other 'true' bands, but I still think they deserve a place in the genre, especially considering the expanding boundaries currently propagated by some of the top line bands such as Mayhem, Thorns, Emperor RIP, and Immortal.
In other words, I think genres should be able to evolve so long as they remain true to at least some of the original stylings.