Not 1, not 2, but 3 sub .500 teams in the top 10. I know everyone was expecting the Cards, Panthers, and Bengals to be really good this year... but they haven't been. The Cards lost to a really good Pats team, beat a mediocre Bucs team, and got embarrassed by an embarrassing Bills team (that you have ranked in the 20s). The Panthers have a bit more of an excuse as their losses have been to mostly good teams (the Broncos and Vikings) but I am still not buying a #5 ranking for a 1-2 team who's only win came against a horrible 49ers team. Lastly you said it all about how the Bengals have performed so far this year. These are not good teams this year, shouldn't their ranking reflect that?
While your brief analysis of the Panther's Oline has a lot of truth to it, I'm not sure it's yet fair to say that their is a problem in the 2ndary. The rooks are playing pretty well and definitely aren't the problem. Another is that they can't get a pass rush because the QBs are having success throwing the ball for short, quick, Brady esque passes, but when throwing deeper, the interior rush at least is getting there, and the corners have been impressing. While they are no Norman at this point, I can say that they are one of the few bright spots so far. The main problem is that the Oline can't block, and special teams can't tackle.
Summary: Robert Quinn was one of the Tar Heels suspended for the season and as a result has a lot to prove. The athletic talent is evident from his sophomore campaign, but taking a year off is never a good thing. Nevertheless, he has the ability to play 4-3 defensive end or convert to outside linebacker in a 3-4. Pass-rushers are a hot commodity in the NFL, and he can get after the quarterback.
Player Comparison: DeMarcus Ware. Quinn has been quoted as saying he wants to be the "first Robert Quinn." I'm afraid if I don't liken him to an elite talent, he might come after me. He does have similar potential. Ware was also a work in progress against the run coming out of Troy, and while he timed faster, Quinn's inactivity due to his suspension has to be factored in. Noted draft guru Mike Mayock of NFL Network expected Quinn to blow up the Combine - which is something Ware certainly did - but the time off prevented that from happening. However, Quinn has a similar innate ability to get after the quarterback.