The Saffir-Simpson scale is pretty antiquated for the exact reasons mentioned. Just measuring wind speed gives a very poor idea of how dangerous or destructive a storm will by, and gives no indication of relative size.
The better scale that the AMS is starting to lean toward is the Hebert-Weinzapfel scale, which has a much easier to spell name as the Hurricane Severity Index, or HSI.
With the HSI model, the speed of wind and the size of the wind field are taken in to account so a storm that is moderate intensity but very large in footprint, like Katrina, has a similar rating to a hurricane with a high intensity and very small footprint like Andrew. Both were similar in the amount of destruction they caused but Katrina was only SS Cat 3 at landfall, where Andrew was SS Cat 5.
But hey, lets just make jokes about Al Gore instead, cause Al Gore. Am I right here people?