1) yes, yes and yes.
2) most definitely, a few great key scenes
3) i think there was only one scene or shot where the suit looked a bit odd to me, but by the end, i was looking at captain america through and through.
The best thing i can say about cap, without spoiling, is that a lot of people were worried about how cap would sort of establish himself as the leader of the team. Well not only does that whole conflict of interested between cap and stark get handled very well, but something we didn't consider is how cap will be seen by other people. You get a few scenes where you see civillians and cops reacting to cap and it was perfect. Exactly like a scene from the comics.
This isn't ultimate cap, this is 616 cap through and through. You see cap delivering orders and you're like 'yes sir!'