Statistically, the New Orleans Saints are strange foreigners to the NFC West. Our division is full of teams with good defenses. For the most part, the NFC West likes the rushing game.
The Saints are about as close to being the exact opposite of the NFC West in those aspects as you're going to find in pro football. They put up huge numbers in the passing game last year and mediocre numbers on the ground. Their defense gave up more points per game than any team in the NFL except the Titans. Only three teams put up more passing yards per game than the Saints allowed per game. Only five teams produced more rushing yards per game than the Saints allowed.
Obviously, they were missing their head coach last season, which would be a huge blow to (almost) any team. Between the return of Sean Payton and the team's offseason defensive additions (including S Kenny Vaccaro, DT John Jenkins and CB Keenan Lewis), they just might stand a chance of plugging some of those leaks.
And here are the stats from the 2012-13 Saints:
Passing allowed: 292.6 yds/game, 7.8 yds/att
Rushing allowed: 147.6 yds/game, 5.2 yds/att
Points allowed: 28.4/game