A complaint about competitive matchmaking

I’m in Platinum.

The other day I played with my usual 6 stack (all Plats) and we were paired up against another 6 stack on King’s Row.

This 6 stack had 2 golds and 4 mid-high level diamonds. The diamonds played DPS and tank while the golds played healer the entire match. An obvious carry and we were completely stomped.

I get that Blizzard wants to make a system where you can play with friends yet not be completely carried by Grandmasters, but there needs to be SOME algorithm that can detect BS as simple as this.