The big three stars of that offense are all quite scary. Murray, Bryant, and Romo can all change a game. I'm most worried about Romo. I do think he has been playing quite differently this season. He seems to be making his way into that elite category where only 4-5 quarterbacks are typically mentioned. I think he's taken phillip rivers place in that discussion—at least this season.
I think in order to win this one the Packers have to make Romo uncomfortable. The lions did that the first half by getting hits on Romo throughout the first half, and he seemed to play poorly. While he was sacked in the second half a couple times he seemed to be getting hit less which got him in a groove.
It'll be important for the Packers offense to sustain drives. The Pack has won some games with less time of possession this year, but I think if the cowboys have the ball for longer it'll heavily favor them in the game. It would be interesting to see who had the ball longer in the fist half of the Detroit-Dallas game versus the second half.