Score will give you ulcers, make you go bald sooner, and in general mess with your game.
Rank is virtually useless, as almost anyone can bomb a sortie, GV a sortie, and fly goon a sortie a couple times a week and get good rank.
I agree for TOD we need to redo rank, and it should be out of sight on our part.
As you fly & fight your rank would be adjusted depending on sucess, successfull landings, etc.