No, game's are intentionally unfair.
They don't put you in a game where you theoretically have a 50% chance to win based on ranks, otherwise you reach true MMR too quickly and stop playing. They give you 5 games where you have a 55% chance of winning, then 5 games where you have a 45% chance of winning and you climb by consistently outperforming in games you're supposed to lose. Makes the climb significantly harder than if you were consistently placed in fairly matched games. Pretty disgusting practice, but it keeps players playing.
Enjoy the grind.
no we don't do that. aim for as close to 50% every time.