The Stanford offense was not good. They scored less than 2 points per possession (78th nationally) and were 81st in yards/possession. They were 64th in yards/pass and 69th in yards/rush. They were well above average at avoiding TFLs, but the Cardinal were not elite in any area offensively.
Which brings us to the quarterbacks. No surprise, Hogan is leaps and bounds better than Nunes. Statistically, Hogan looked a lot like Everett Golson: a slightly less efficient passer, a slightly more efficient runner. And given that Stanford and Notre Dame were similar defensively - very similar EP3+ allowed, relatively high plays/possessions, Notre Dame was much better close to the end zone - it is reasonable to say that Stanford with Hogan for the season may have looked very much like Notre Dame.
After just saying that Stanford could look very much like Notre Dame, and recognizing that Notre Dame just played for a national championship, I still think Stanford is coming in to 2013 overrated. Hogan was 38th in passing efficiency among qualified quarterbacks, and the team was 33rd in EPA+/rush. Last year, Alabama scored higher than Stanford in EP3+ allowed and Kansas State, Oregon, Florida State and Georgia were all within in spitting distance, and all had much better offenses. We did see what happened to Notre Dame against Alabama, right?