I am a big Auburn fan and have seen almost no Kansas State football this season, so take what I have to say with a grain of salt.
You guys are overreacting to your close game against Iowa State. The Auburn game has been circled since last season on Kansas State's schedule. It will be a night game in your own building against a top 5 team. A morning game in Ames is easy to look past when you have such a big game coming up. This will be the first road game Auburn has played since Tennessee in early November last season.
That being said, the problems your team has are probably real because even looking past Iowa State, you shouldn't be giving up 28 points in a half to them. However, Auburn has problems of their own. Our secondary can give up big plays and we are not the best tackling team. Our defensive line is good and if they get penetration/pressure it will almost certainly be a long night for you... but if your O-Line can hold up, you will be able to move the ball both on the ground and through the air.
Auburn's offense is no joke though. Nick Marshall's passing ability is questionable at best, but nobody has really been able to stop the read option. Corey Grant is one of the fastest players in college football, and Cameron Artis-Payne has been very effective running between the tackles. I think he is averaging about 7 yards per carry this season right now. Even Florida State with all of their NFL talent on defense gave up a ton of yards on the ground to us.
If I were handicapping the game, I'd make Auburn a 14-17 point favorite in a high scoring game (over/under in the mid-high 60s). I look forward to seeing the game in person next Thursday.