Expected rank decrease after win

Not exactly a bug but a serious problem with the rank gaining system, if im silver 3 and im placed in a game with just golds and platinums with 2 other silver 3s, win the game and it says “expected” so i gain less rank, that is absolutely taking the mick, i shouldnt gain less, if youre expecting me to win against golds and platinums when im in silver, put me in that rank if you think their a similar skill to me, or drop them all straight down to silver 3, genuinely makes no sense at all