I don't really see that there is anything wrong with the mdm genre. I mean to the untrained ear there isn't a difference between a death metal band like say.......Hypocrisy (well maybe with the exception of "Osculum Obscenum" or "Penetralia") and a "brutal" death metal band like Disgorge. Now as a fan I could say oh yeah there is a big difference between the two. With a band like Hypocrisy (just using Hypocrisy as an example for those who are not fans of the band) there is alot more going on musicly in terms of guitar riffing, drum fills there's a degree of melody. Now with a band like Disgorge (again whoever you may like) they just slam you in the face with BRUTALITY. They don't even try to disguise that they just want to F you up. Now back to my main point, mdm is a nice break at times when there are nothing but Cannibal Corpse tribute bands brutality and you need a slightly less in your face dose of death metal.
BTW anyone have any thoughts about a band called Arkan and their 2008 release called "Hilal" Now there's a "death metal" full of diversity.