The whole point is shes not super hot. A girl with giant boobs and pouty lips would scream: "We still want to attract 18 year old males." Jenna Jameson types would immediately repel that specific audience that Nintendo is now trying to attract.
Again, these commercials are for Brain Age -- they're for adults. The goal was NOT to get a super sexy woman, but to find a classy woman who looked appropriate and sophisticated. They chose very wisely.
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