RfA grading is a simple tool I use on Wikipedia:Requests for Adminship. I give each user points for different things on a weighted scale, and give an overall grade. For example:

RfA Grading: RfA grading

Need for Tools

5/5

Interaction with Users

20/20

Edits

15/15

Other

10/10

Total

50/50 (100%)
A

Users Graded: