Neil Fisher [Times Online, 8 November 2008]
I hear Susan Bullock before I actually meet her. And what I hear is pretty disturbing. I am skulking through the vaults of the Royal Opera House; her powerful soprano, with its rich vibrato wrapped around a steely core, is blasting out of the Tannoy on the wall. And, if I know my Richard Strauss, Bullock is currently urging her long-lost brother to kill her mother. With an axe. That her character has been keeping in a hole in the dirt. Which is also where she lives.