I think the answer to your question is that pettine looks great because of who he replaced. Wannstedt had a lackluster doormat defense out there every week. So when we finally have a defense that hits and flies all over the place its exciting... Not to mention, the offense leaves the defense on the field way too long.
Offensively. .. we saw what essentially the same offensive personnel can do under a creative mind. And this ain't it. Yeah Levitre and Fitz are gone and Manuel Woods and Goodwin are new but. In comparison, this is a massive letdown