I don't think staff should be separated from each other by one being better than the other. All staff members are on the same team, no matter the amount of work they put in.
once a player has received service from a mod or helper they can ask to have their service rated on a scale of 1-5 anonymously
you're not being very specific; how is it demotivating? how will it cause a backlash? what will cause it to be horrific?