I seen Akercocke support Dismember in Glasgow and they were laughed off the stage (I thought that was a bit much personally) . Some bits of their music are good but some of it i find embarrassing. The 'monk choir' parts I cringe at and the suits !, rather than create some image of evil they just look like they're at Francis Rossi's wedding.
I don't know how many videos they have but I saw the one on the Terrorizer CD and that was embarrassing too. It's not extreme, it's just graphic representations of very old cliches