Watched it on On Demand last night, and loved it. A-
I don't understand the complaints about how did he learn to fight and all that.
The movie clearly showed Skinny Steve had alot of Spirit and tried regardless of failure. Gaining muscle wouldn't change that, he'd still strive to succeed with all the "Manly Soldier things". We see when he first leaves the lab, how uncoordinated he is and he keeps at it, and by the time he catches up to the guy, he's starting to get coordinated. I think it goes without saying (or showing) that he could keep at it day after day, night after night until he became all he could be.
Shame about Bucky, though apparently everyone in the know believes he'll be revived later in the Series. If he undergoes a personality change (IE: Goes evil), I hope it doesn't ruin the character, and that he can be enjoyed as that new personality.