To be fair, I think those instances are more incidental than anything else. If you were to compare a common human with a common orc, the Human would likely be more intelligent, hence why Humans were able to progress into having a relatively sophisticated culture and geopolitical system (prior to the downfall of the main Human kingdoms brought about by the Scourge, they were an agricultural society), while Orcs were still comparatively primitive in their culture and abilities (living in disparate hunter-gatherer tribes, each with their own superstitions). However, that doesn't mean that there aren't extraordinary individuals from every race that break away from the common rule.
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I think those stats are meaningless right now. Weren't race's stats normalized to be equivalent in Cata to account for cries of imbalance (ie: Tauren having slightly more health than other tanks due to their inherent racial bonuses)?