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.
What you see is what you get. We’ve got Maclin penciled for 75/925/6 which is right about what he’s produced on average in his career. Of course, if you can draft Maclin where we have him ranked then you’re leaving yourself room for considerable upside in Chip Kelly’s new offense.