Super Bowl 2014......?
Conversely, what happens if one team is a finesse team and the other is physical? Like the Colts vs the Bears in 2007...the Bears were clearly the lesser team in Miami, all things being equal, but in a snowy NY winter game they may have won just because the weather would be their 12th man.
What would be worse, in your opinion? A crappy game overall where the winner is just the team that managed to screw up slightly less, or a game where the conditions let a lesser team win?
Super Bowls are supposed to be neutral site - which means the field confers no competitive advantage to either team, unlike regular season and playoff games.