I don't think any of the games this season were particularly unbalanced. Some lucky/unlucky breaks might've given the illusion of imbalance but technically speaking they all seemed sound.
I agree that there will always be lucky and unlucky breaks that effect games and that you can never account for everything, but I also think that when designing games it is important to at least try and make the game in such a way that it will be a bit harder for a single lucky/unlucky break to have an enormous impact on the game. A single role being removed from the game early should never completely break the balance of a game, there should be things in place to prevent that from happening.