Hehe, I was actually joking. Credit to you two though, I was expecting an extremely prejudiced verbal slaughtering.
Like 'norsecore' styled bands, I'm not sure whether I consider Dimmu black metal. I consider them black metal in the sense that, if they could only keyholed into one major genre, then they'd have to be black metal. (shit metal, gaythenburg, mallcore styled comments aside) But of course it's not that simple.
I dunno, they certainly have pushed the sound of black metal, but not within the realms of true black metal, so they have and they haven't pushed the envelope. Of course, the fact that they're relatively commercial now puts an unfair and prejudiced tarnish on the sound, but as an aesthetic development from the constraints of true black metal, I think Dimmu Borgir have done some important work....even though i'm personally not fond of their latest stuff, you'd have to be really 'true' or just weird and narrow in your tastes to not appreciate the excellence of Enthrone Darkness Triumphant.
Overall though, i'm not a big fan of symphonic black metal, but there's a few bands and albums I enjoy.