In my opinion, Captain America has had the most difficult task in making the transition to the big screen. Primarily because both his character and his name comes from the American Armed Forces, not exactly the most popular of organisations across the world.
The first film wisely took Steve Rogers , aka Captain America back to his Second World War roots. After all few can argue with a man fighting the Nazis. That film ended with Steve Rogers being frozen in the Arctic Sea only to be awoken seventy years later in the present age.
Captain America: The Winter Solider is set after the events of Avengers Assemble and sees Rogers (Chris Evans) having to cope both with life in the present day as a civilian. The film sees Rogers working for S.H.I.E.L.D. and being confronted with the reality that things aren’t just as black and white today as they were during the Second World War. Who are the good guys and the bad guys? Who can he really trust?