I like to think that in the source material he might have been, but in order to make it "relevant for modern audiences" and also because the Hollywood people could not grasp the moral reasoning originally, they came up with this lame-ass justification.

Situations where he uses the power right. Don't write the film as if his eagerness to go into battle is evidence of virtue, but rather show his willingness to sacrifice for the greater good. Of go into more detail about it being the kind of tactical acumen hinted at when he defeats the impossible flag pole challenge at the training camp which sets him apart. Men should follow him into battle because he comes up with ways to pull off impossible missions without large casualties. Make him strain those superior abilities. Come up with ways to save the day by audacity and gutting it out to pull off stuff that should be impossible on paper. Things like that.

And speaking of airheaded chick's reactions to super-soldier types, the British chick's sudden attraction to Steve after the injections roid him out would be akin in my mind to a guy ignoring a plain chubby girl until she went into an injection machine and came out with an hourglass figure and refined facial structure, and then distractedly staring at her chest while an infiltrator shoots up the room.