Most of my comment posted above, but I want to add this.
Regardless of the system -- be it keeping the current system, adding another attribute or going toward a check off system,
I think that you need better descriptions. Unambiguous
"average" is just too general.
Also, I have changed my mind on the skill rating issue. Maybe it should be included, but completely seperate from the other "attitude" issues, but only so we can see who actually thinks they can judge skill better than the ranking system. Might be a handy way to know who to ignore.