Strength of schedule is calculated from the opponents projected fantasy points allowed for the WR 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.
Simpson is a very low-upside option as the third receiver in the Vikings passing attack, even in a revamped Norv Turner offense. Even when he has been a feature part of the attack his impact on the stat sheet has been underwhelming. He has a heck of a standing back flip though.