I get frustrated when I earn 4+ top scores and am on the losing side and watch my rank slide. I mean if I score top kills, offence and defence.... it probably really ain't me that lost the game. It'd be really nice for you to lose no (or less) rank if you get some large subset of the top scores.
And yes I see that you'd want to make sure it wasn't something like healing, revives, defence that was enough to grant this immunity to rank loss.
I think if this happens Anet's match making algorithm should lose rank instead