Ultimately, it depends on when the penalties happen in the game. Sacks, if offset by personal foul penalties on the same play, don't help us, but rather give free first downs to the defense.
Classic case in point is the 2011 VT game. We had just taken the lead, had momentum going in our direction, and had VT in a 3rd and 19 inside their own 20. Jeremiah Attaochu sacked the QB for a 2 yard loss, but then threw the infamous punch that gave them the first down. Momentum swung and VT pulled away in the 4th qtr to win.
If we play aggressively, penalties are sure to follow. Kyle Kennard's offside penalty for timing the snap wrong I can handle. The inadvertent roughing the passer or incidental facemask pull are understandable. Taunting and deliberate personal fouls born of frustration will doom us.
Fortunately, I think Key will keep all this in check.