Hi Mr. Kilmer, i recently changed my brake pads and rotors with a mechanic. But from day 1 there is grinding streaks on my new rotor like it was on my old one when my pads were worn. I can't hear any grinding sound though. Is this supposed to happen or my rotors should have stayed plain and pristine. Has he ripped me off?

sounds like it, maybe he used cheap pads, they do that, or cheap rotors. If parts are aftermarket I would be suspect