Football Outsiders has posted the Week One VOA rankings. In a few weeks it will be DVOA rankings, meaning that the numbers are adjusted for the strength of the opponent. That's important to keep in mind.
Still, the Vikings currently rank 4th in total team VOA, helped by a -41.2% defensive VOA (on defense, a negative number is good). Interestingly enough, though the offense scored just 10 points and failed to reach the red zone, the offensive performance was above average (10.9% above average). Football Outsiders measures a team's productivity for each play, so the ability to move the ball effectively according to down and distance means more than points or total yards.
Again, these numbers haven't been adjusted for the strength of the opponent. But it's still an encouraging sign that both the offense and defense make the team look good here.