Strength of schedule is calculated from the opponents projected fantasy points allowed for the DEF position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
Another team transitioning their base defense. Sadly, they are less well equipped to deal with it than some others. This is going to be a long year defensively for the Saints, having struggled to break the 35 sack barrier for the past 3 seasons. In 2011 their sack leader was even a safety. It's even harder now to envisage where those pressures are going to come from on a team that surrendered a league high number of big passing plays.