It's a five year sample man, not just recent. Klingberg was an awesome pp dman in Dallas.Individual contributions don't mean a whole lot when you're contributing to historically bad powerplays. There are certain things that don't apply to the stat sheet that can make a powerplay poor. Holding on to the puck longer than you should, making poor passes and taking soft shots that go wide are not things most people take stats for. The fact that both Klingberg and Fowler appear on that certain stat of yours should tell you that its not the be all end all of the debate, considering both were on the Anaheim team that had a god awful powerplay.
If you have a bad system, then you look at the parts making up that system to see what isn't working. If one of the parts is performing, then it would stand to reason to look at the other parts. Maybe people should focus on that.