This is maybe the best Marvel movie yet. Thor, The Dark World had put the bar a bit high after the Avengers, and now, Captain America, The winter Soldier has made it clearly higher. I'm not going to tell here really nothing about the story of the movie, you have to go and see it.
I'm going only to say that this movie has a fast action pace, almost non stop. Since we know now the origin of Caps, there is no need to go to the boring stuff. Action from start to the end.
In this movie you will be able to see good action scenes with "Batroc the Leaper", "Black Widow", the "Falcon" and obviously the "Winter Soldier". You will have also a nice re-introduction of "Arnim Zola" in his first version has a virtual entity and a direct hint with a mention of a threat to HYDRA from Stephen Strange (aka Doctor Strange).
And last but not the least you will be able to see in the post credits the connection to the "Avengers: The Age of Ultron" with 3 new characters. Baron Wolfgang von Strucker, Pietro Maximoff (Quicksilver) and Wanda Maximoff (Scarlet Witch), the two only mentioned as "the twins".