Not having a bassist doesn't give them any excuse, Pig Destroyer still manage to sound perfectly like Grindcore with just drums and one guitar. But that's not the issue. That V for Vendetta you posted in the forced listening thread, didnt sound anything like Math to me...that's the issue I have. No energy or even complexity in that track.
Though on a little digging, some people actually consider Orthrelm Metal of a sort. Just send me a list of all the math stuff you listen to....I'll see what I can get hold of when I get the chance really. Dont worry about being...accessable or anything like that, considering my tastes.
EDIT: Downloading the Orthrelm album "2nd 18/04 Norildivoth Crallos Lomrixth Urthiln" now....see what it sounds like if I can get all of it.