If you try leaving a game that is one-sided, you’ll notice that the next game will be the same even worse. Anyone else experience this?
That is a side effect of the forced winrate. The game wants you to lose and by leaving a match you are dodging a lose so the game tries to make you lose again and again.
sound like some purgatory sht 
so if i leave winnable games, will i get favored next game?
if you join immediately yes, but if you wait 1-2 minutes or join on other role it’s ok.