I don't think that the refs can actually decide the outcome of the game or officially cause a team to lose the game. However, I do believe that the calls they make can swing the control of the game towards one team over the other. Bad calls are always bound to happen, but when calls aren't made(6 men on the ice) or one call is made on one team but not the other, it makes people doubt and criticize the refs' decisions and perception.
Bad calls lead to a PP advantage for one team and if calls are constantly being made against the other team, PKs become harder and harder. By no means does it control the PK but it gives that team the opportunity to even the score or take the lead in a game. Penalty after penalty on the same team can cause damage i.e the wings in Game 4 against Chicago when the Wings had 11 mins and 40 some seconds spent in the box.
Again, refs are not game deciders but they do play a role in it atleast. Ex: the call against Ericsson. Yes, the PK was bad, but the refs gave Pitt to the upper hand and they scored; or the two calls made seconds within eachother against the Ducks and the wings just couldn't kill two penalties back to back and the Ducks scored.
Anyways, just my two cents I love this board and have always kept up on it but never posted. Hello fellow Wings fans!!
GO WINGS!!!