First half of the movie serves as the secret origin of Cap and the character arc that takes him from a well-meaning kid who can't make a difference to a hero. I can watch that pretty happily over and over.
The second half of the movie doesn't do much for me, it's about Cap fighting Hydra, and finally crashing the plane into the North Atlantic and getting frozen in a block of ice (only to be defrosted back to life in the 21st century at the very end).