If you're looking at fancy stats for the PP or PK, that's where, as someone mentioned earlier, you want to look at rates or at production relative to teammates and opponents. If a guy produces 5.5 expected goals per 60 minutes on the power play, that's great, unless his teammates are producing an average of 7.5 expected goals per 60 on the PP. Or if the league average is 8.5 g/60.
As with all things, context is key. Advanced hockey stats do a better job than traditional stats, in my opinion, of putting a player's performance in the proper context so it can be evaluated against other players on a level playing field. But they still should not be used as blunt instruments.