Agreed, which is also why I've been pushing for moving Steve out of the military for some time now.
Perhaps the most important issue with Steve is the lack of stories surrounding him. The movie gave him a compelling one, and meeting Diana should easily give room for another one that doesn't kill him: Steve deciding the military isn't for him anymore.
Now, I think there is room for a male damsel in distress, but right now Steve is not that good a one. His relation to Diana pushes him in that direction, but the way that he is a dude and badass soldier to boot means that what is subversive for a princess (being self-rescuing) isn't for him.
There are really two ways of fleshing out characters. One is to add details to them, like the above. The other is to give them texture and personality. We were told exceedingly little about movie Steve, but he had plenty of personality. With Rucka's Steve, all we got was some vague undefined longing for something, which was filled by Diana—and then nothing.