So this is basically a copy/paste from tumblr, where I have talked in the tags of various posts about things, so this isn't a complete picture of my thought. It's very close though, but it is stream of thought, and so terribly late. It's also 3.5k long.
I love the fact that in the first five minutes, they made us love Sam. I was expecting that scene to come after the ship scene, but no, it was first. (A lot of the war-related trauma and RSA (or whatever the American version is called) went over my head, except for the fact that war is a terrible thing and they both experienced it.) And they just lead in with how Sam has a sense of humour and is understanding and valiant and compassionate.
He's a pretty good 'foil' for Steve too, because his quest for righteousness in the world, while on a smaller level, starts with the personal rather than the national/global. I really want to see what he thinks about Steve's quest to find (and rehabilitate) Bucky, because while that is a personal scale motive, Sam isn't going to be concentrating on Bucky, he's going to be focused on Steve and how it's affecting him.
And a note about this being set in DC: I watch Bones, it's set in DC, there's lots of semi-romantic stuff with the cenotaph/memorial in the distance and the reflecting pool and the Lincoln thing. Plus I watched X-men: First Class and the very subtext laden chess game on those steps RIGHT WHERE THE CAMERA WAS FOR STEVE AND SAM RUNNING.
Basically a ton of stuff I've watched associates that shot of staring down the pool at the memorial with establishing relationships and reaffirming them. Maybe it's the only place film crew are allowed to shoot from, but that shot definitely went a long way to establishing Sam/Steve as a valid ship for me.( Natasha sharing most of the funny lines with Sam was lovely )