legit afc steelers ravens patriots, legit nfc pack and saints
I'd say that there are five "legit" teams per conference as of now (could be cut back further, though): AFC-- Patriots, Ravens, Steelers, Texans, Bengals; NFC-- Packers, 49ers, Saints, Lions, Falcons. Pretty much if a team can make the playoffs with a respectable win/loss ratio and/or have a respectable win/loss ratio, then they're "legit" in my eyes.
In addition to that, each conference has a "meh" division, namely the AFC West and NFC East, and then the "good" divisions all have one reasonably terrible team with five wins or less. As for AFC vs. NFC, the NFC has an edge by being up two games over the AFC; odds are that would be very different had the Colts been a "legit" team this year like they usually are.