Strength of schedule is calculated from the opponents projected fantasy points allowed for the TE 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.
UPDATE 6/26/13: Hernandez was released by the Patriots today and as such should not be drafted. It is very doubtful at this time that Hernandez will be playing in 2013. 5/15/13: Rob Gronkowski wasn't the only New England tight end to struggle with injuries in 2012, as teammate Aaron Hernandez was on the shelf for six games last year. However, unlike Gronkowski, Hernandez is all systems go for training camp. With "Gronk's" health still an issue and Wes Welker now in Denver, Hernandez could be in for a big bump in targets in 2013. The possibility of elite fantasy numbers at a somewhat reduced draft-day price makes Hernandez an intriguing fantasy target.