Well it's by definition not exceptional if all comparably placed CEOs are performing the same. :) But, nitpick aside, I agree there's a flaw here, since it does

Well it's by definition not exceptional if all comparably placed CEOs are performing the same. :) But, nitpick aside, I agree there's a flaw here, since it doesn't differentiate between the CEOs performing "to spec" or under spec. Though, when you get to have an agglomeration as big as a large multinational, there have to be serious missteps or moments of brilliance to really differentiate a bad and good CEO. Otherwise, it's hard to tease out the relationship between company performance and market share, entrenched employees, quality of invested capital, etc.