You mustn't have been paying too much attention.
Sure, we may not know too much about Steve's past, but we're given enough information to root for him. He's a skinny, humble guy, who just wants to fight against those he considers to be "bullies" because that's what he believes. He's willing to take a beat up in order to stands for what he thinks is right. He insisted on signing up for the army, even though they constantly rejected him.
Plus, we do know his parents died in the war. I don't know what else you need to see in the movie in order to root for him. I think if the movie had spent any more time showing "skinny little Steve" people would be complaining about that instead.
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