I think that's way too low. Aaron rodgers will have a field day and the game won't even be close. *insert Aaron Rodgers, ESPN Clip where he does "COME ON MAN"* Also Mike McCarthy will light up the zone defense of the niners as well. All in all, I don't expect this game to be pretty, unless your a packers fan.
I guess the upside is, the niners aren't as favored to lose than the raiders... (+13 against the chargers)