I was disappointed to be honest. Like other Marvel sequels the story, for me, had its feet too far planted in both the past and the future of Marvel's universe. The reveal of who the Big Bads are working for is just a twist for the sake of referencing the older films and adds nothing to the stakes of the movie: it just replaces SHIELD becoming bad with an organisation that always was. The Winter Soldier, conversely, is only really in the movie to set up his encounters in future films, and is only made 'important to the story' by, again, linking him to the events of previous films. The film could function perfectly fine by just replacing him with common henchmen; which is a shame because he was an intimidating presence.
The problem I have with all these 'references' is that, for me, they bogged the movie down. Everything to do with Rodgers coping with no longer being in his time I really enjoyed, because, even though it featured throwbacks to The First Avenger it reinforced his ideals, his isolation, and made his trepidation over SHIELD all the more believable. Conversely, they do bugger all with showing how he reacts to The Winter Soldier's identity, which just reinforces the point that these were references and twists just for the sake of it.