I thought NDaccountant had a really good post above that everyone should check out. This team is very similar to the 2011 team on many different levels, but the personnel is probably worse (or simply just younger/more inexperienced) across the board.
I think Michigan 2013 was our USF. USF brought their A+ game against ND, and then ND exacerbated the problem by crucial turnovers/penalties. The same thing happened this year aganst Michigan... perfect storm of incredible plays by Gardner, costly turnovers leading directly to points, and some crucial penalties. ND in 2011 was 8-5 but it wasn't for lack of fielding a pretty darn solid squad. The losses were to 11-2 Michigan, 10-2 USC, 11-2 Stanford, and 9-4 Florida State who was very talented and we were beating until Floyd got hurt. It's also important to remember that the 2011 D > 2013 D on a number of fronts. 2013 sure as hell doesn't have a Harrison Smith level safety or Manti Te'o on the field... even an NFL caliber CB like Darrin Walls would be a big plus.
Much like 2011, our problem will be our schedule. ASU and Oklahoma are both bad matchups. Stanford should eat our OL alive. USC and BYU both have very good Ds. It's going to be very difficult to do better than 8-4.
If we were going to do better than 8-4, it would've been on the back of an explosive offense. I think the coaches expected us to be able to run the ball better and that's just not happening. I do hope they realize that it is equal parts predictability and execution, and that with more deception/creativity they'd have more ways to get explosive plays. But short of the O taking a miraculous big step forward somehow... whether different play calling, some Hendrix/Zaire, or who knows what... it's just going to be very hard to win 9+ games because the D isn't designed to shut teams out like last year.