Yeah, the breaks and big plays went the Steeler's way and that really told the tale of the game. Seahawks had a bunch of momentum killers (missed field goals, flags at the absolute wrong moment, dropped balls), and they didn't really try anything on offense to break that sense of swimming upstream. The Steelers had their end-around, bootleg passes and halfback passes to create big plays -- the Seahawks continued to play it pretty close to the vest even when the game was in a bad pattern for them.
The Hawks had a team speed advantage, but never capitalized on it and never really tried to do anything out of the ordinary -- which given the outcome and with hindsight I'd have liked to see them try something out of character to break the game's pattern.
Add to that really poor clock management before halftime and at the end of the game.
The Hawks weren't ready for prime time.