Cameron is a good example of why slugging percentage is not always the best way to gauge someone's power. His average is too low to make his SLG look respectable. His IsoP is .198 for his career, which is well-above league average. Think of it this way: In terms of SLG: Cameron last year: .477 League average last year: 417 Cameron is roughly 14% above the league average. However, look at it in terms of IsoP: Cameron last year: .234 League average last year: .152 Cameron is roughly 54% above the league average.