I don't know..
It's not just Death metal. And it not JUST growling. There are all sorts of bands, often in some genre like whatever-'core' too, where there is screaming, growling, whatever. There are lots of songs i'v heard that start off sounding like great metal, then the vocals come in and....yea.
I guess i'm just not into 'extreme' metal like that. But something like Catch 33 by Meshuggah i like, where it's a death metal-type band doing something different and unique with an overall concept providing a unique experience that takes you on a journey you can't really explain. There's another band, I believe it's Isis.....yea, Isis, that does stuff like that. Less heavy guitars obviously, but growling vocals that work. I heard a bit of the band Palms, now that is bring two really fuckin great things together. I should like it if i ever get to buy it.