Strength of schedule is calculated from the opponents projected fantasy points allowed for the PK 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.
Regardless of how you assess the state of Oakland's offense -- which obviously is playing at a competitive level -- the Jets have allowed opposing kickers to convert three or more field goals in all three weeks since their bye.
[Janikowski does not kick for a high-scoring offense but his cannon leg and consistency still makes him one of the better fantasy options. Despite the Raiders troubles on offense, Janikowski ranked fifth in field goals made last season with 31 and he connected on six kicks from beyond 50 yards. He only had 25 extra points though, so if the Raiders' offense can improve, Janikowski's fantasy value will as well.]