Well to explain my opinion ...
i want a signature that shows the graphic of the font not the background ..
For example Chris' siggy up ...
it's shows only Font +ambrosia .. that is what i like ..
in the siggy crity provided ... i say yes it's a great graphic from graphic side .. but as siggy or avatar it doesn't show .... well .. pretty much doesn't show the Ray font much ..
designer focused on the background more than font.