I think AZ can be good just based on the strength of their schedule. Playing St. Louis and San Francisco a total of four times could be a guaranteed 4-0. Then they have the whole NFC North (Green Bay, Chicago, Minnesota, Detroit) which isn't exactly the most dominating conference in the NFL. If they can pull out one or two wins between Seattle (x2), Denver, Kansas City, Oakland, Dallas, San Diego, or Atlanta, it wouldn't be a stretch to see them have an over 500 season.
The only problem with AZ is that they'll have to get to the playoffs by a wildcard because of Seattle (who's schedule is arguably as easy considering they play Tampa Bay and NY instead of Dallas and Atlanta), and the NFC East probably already has a wildcard locked up.
I'd like to see them do well for once...