I think the rain & weather made that game exciting. The opening kickoff was returned for a TD and the game was still close until nearly the end of the 3rd quarter.
The worst Super Bowl, IMO, was the 55-10 drubbing SF gave to Denver in 1989. Followed by the Bears dominance over NE in 1986.
That said, I find this year's Super Bowl unwatchable. For me, the 2008 NFL season is over. While many people will always tune into the Super Bowl, but this is about as unattractive of a matchup as the game has ever had unless one is rooting for his/her team. I refuse to watch.