Brutal/Slam Death Metal

Benighted aren't really "brutal death metal" nor are they slam, but I did play Saw It All on the air during my interning at the college metal station yesterday.
 
There are a lot of bands labeled as brutal death metal that don't sound like it to my ears. Nile, Desecration, Skinless, Defloration, Prostitute Disfigurement, Hour of Penance, etc., just to name a few.
 
Skinless and Nile just have mammoth sound. The vocals and the riffs are just a giant wall of sound. That is why people call them Brutal Death Metal.