Statistically, they look scary. Loads of yards, really spread the ball around (passing and looking rushing), and they take care of the ball. Should be a good challenge.
We've seen the Hawks confound a lot of really good offenses over the years, hopefully it happens again.
We take it for granted, but I have wondered lately if facing the Hawks on D is almost a bit of a "change up" for teams. Kinda like facing a triple option team. I'm not sure anyone else runs such a conservative, vanilla scheme as we do on defense. Almost no personnel changes or blitzing, just sitting back in a zone daring QBs to make a perfect throw. I bet some OCs have had a hard time getting their guys to take our D seriously.
Imagine coming off a game where you faced some kind of 3-4 or crazy hybrid with blitzes coming from all different directions on 80% of the downs. Crazy disguised coverages and stunts. Then you sit down in the film room to look at Iowa. 4-3, cover 2, no blitzing, no package changes. "Coach, u serious? This is target practice!" It takes a little game action to actually appreciate sometimes I bet. There are known soft spots but you gotta be perfect to hit them. Lots of college QBs can be perfect on a given play, but how many can be perfect play after play? Not many.