Basically you rate the person above you's signature. You rate them out-of-five on creativity, out-of-five on style, out-of-five on humour, out-of-five on wisdom and out-of-twenty overall. IYW include a reason

Nobody ever reads signatures-- now for once they can get attention!
EXAMPLE FORMAT:
Creativity: 0/5
Style: 0/5
Humour: 0/5
Wisdom: 0/5
Overall: 00/20