Hey to each his own ya know ... DM is just really not my thing. I prefer vocalists who "sing" melodically. WD, Geoff Tate (in the 80s anyway), Joe Lynn Turner, Ray Gillian, Halford, Dickinson, Barlow .... you get where I'm going with this.
Today guys like Russell Allen of Symphony X and Jorn Lande just floor me. There are a few guys who sing with that DM kind of vocal that I like, Randy Blythe from LoG is one of them as is Jeff walker form Carcass. I guess its really being able to understand the lyrics, even though the aforementioned guys "growl" they still enunciate the words and make them intelligible.