I think we need an open-ended logarithmic scale, like decibels or the Richter scale. There is no limit to idiocy -- as Obamamania shows.
Perhaps we should call it the Rosenthal scale, after the late unlamented NY Times editor. The scale is calibrated so Rosenthal himself is a 10. The Rosenthal rating equals the logarithm of the product of quantity, emotional intensity, and the inverse of originality:
R = log (Q * I * 1/O)