British art critics have not been enjoying their time at this year’s Documenta festival in Kassel, Germany. “Documenta 12 is a disaster. I thought at first it must be me. After all, it is always good to stir things up a bit, to disturb hierarchies, rattle the tyrannical white box, juxtapose the new with the old, the dead with the living, east against west, the brilliant with the talentless, but hang on a second!”