Old Spice marketing was based on a fantasy theme. This means a shared fantasy of your target audience. It's their inside jokes, heroes, villains, hopes, fears and other cues.
The Old Spice commercial created a portrayal of the ideal man, an over-the-top representation of everything a man may aspire to be.
Isaiah is tall, handsome, muscular, confident, smooth, witty, capable, cool, charismatic, intelligent, and one could assume he smells fantastic. The Fantasy Theme is powerful here.
It communicates to women what an ideal man's standards may be - quite unachievable.
To the men, it communicated the absurd requirements to be an ideal. To take some of the pressure off themselves, at least they can smell like him