i dont understand how the system works anymore

this game should not have happened, this was team builder but we all joined one at a time. look at this, how is our mmr not monumentally higher than theirs. we completely decimated them, we pinged we warded we worked together so well. and the enemy team flopped. riot, this was game was funny, not fun.

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1816744955/203807166