As an aside, I find it interesting that you're Gold 1v1 and Bronze 2v2. I'm Silver 1v1 and Gold 2v2. I'm not convinced the ranking system for 2v2 and above works very well.
But I do agree that ranking for larger teams is poor - for example, I'm 3v3 Platinum, and I'm definitely out of my league - I think I ranked their as a result of being lucky in terms of getting good team mates.