They beat the Giants, barely, who are number one in pass defense. If Brees has any kind of reasonable day, he will put up good numbers again as the Titans are 30th in pass defense. But you guys already know that.
The Saints have always had a bad habit of losing badly the week following a huge win. In 2011, they beat the Colts 62-7 and lost the following week to the St. Louis Rams. Of course, that was also the same week that the St. Louis Cardinals had won the World Series so the fans and the Rams players may have been riding high.