I was pretty much an impartial observer for this game, though I did pick Pittsburgh to win (by a margin of 10...just missed). The officiating was definitely a problem, and one that the NFL had better address. But did it determine the outcome? No. Influence, possibly, but the refs did not win the game for the Steelers.
It could be argued that Seattle lost this game as much as Pittsburgh won it. But the Steelers did make big plays when they had to. Interestingly, the Seahawks bettered them in every important statistical category - time of possession, total yards, and turnovers. Normally, the team that wins those battles wins the game.....normally.