It's rough, I think often times it's the team that has the worst player losing, instead of the team with the best player winning. The odds are in your favor though (assuming you're not the worst player in the game), so just keep playing and you'll climb. The struggle is trying to stay level headed through those unfortunate, unwinnable games. We've all thrown games we could have won because we were 'tilted' from the previous 3-4 losses before, it's important not to dig yourself into those holes and play ranked with a poor mindset.