So, let me ask the higher end level players this: If you were getting Gold medals in damage and eliminations, that meant you were playing D.Va wrong because she was supposed to be the DM bot protecting her team.
That didn't mean you were playing D.Va wrong. No matter what character you are playing, medals generally can't tell you whether or not you are playing the hero right or wrong. Playing D.Va correctly often got you golds before because she also shat damage along with having DM.