Then why have it if you admit it will be open to abuse? If jerks are going to jerk, why give them more information to use? People become more abusive with more information. With the ability to record concrete numbers, opens the floodgates of selection, separation, and then admonishment. "Well *IM* doing 800 DPS, you can't be doing more than 400, so you are bad." Will occur far more often than "Well, IM doing DPS and you are generating half my threat, you are bad" because a good portion of putting someone else down is attempting to show off yourself. And that is awfully hard when you don't know for sure.

If you want to work on rotations and such, perhaps you should ask for a dummy that, when it dies, gives you details on how quick it died taking so much dmg or w/e But having access to them any other time will result in the mechanics being a vector to abuse others.