Provisionals

So I was wondering, during your provisionals, how are the teams made? Is there math behind it like mmr or rank or is it something else. I have had bad games ion my provisionals and I know what I have done wrong and I know people get carried to tiers that they shouldn't be in, but I can handle gold level players and yet almost every team I have been with, I am the only one able to handle gold game play. What I feel needs to happen is that during provisionsals and regular gameplay, that rank shouldn't be declared based on a win or lose statistic. Look at the pros, there are teams that never win a game or only win 1 or 2. But yet they a have the skill to be at that level. I feel like there should be a rating system similar to champion mastery score where you are marked based on how you play the game based on other players of different divisions. Example D or C = bronze. B or A equals silver to low gold. S or higher should be at least gold or higher. This should be the system how players get chosen for their rank. Not based on wins and losses.