Civil War is one of the 2016 entries into the MCU. It was directed by Joe and Anthony Russo and brought back nearly all of the MCU main characters/actors. This movie was really a sequel to all the various movies that have come before and was as much an Ironman sequel as it was a Captain America sequel. I will not go too much into the story because to do so would be to give too much away. But there are elements of revenge, misdirection, and, most of all, consequences for the things that came before. It is really the first attempt in the movies to deal with the collateral damage done to the ordinary public after the big climactic battles like those of the two Avengers movies, the second Thor movie, etc. The fallout of that collateral damage leads some characters to agree to let the United Nations decide when and where to deploy the superheroes, which begins to fracture the team. What ultimately causes the biggest rift is a much larger storyline involving Captain America (Chris Evans), Bucky Barnes (Sebastian Stan), and Tony Stark (Robert Downey Jr.).
This transition movie is bridging what has come before with what we know is coming, specifically the Infinity Wars movie. This movie leaves the Avengers team very much tattered, with Thor and Hulk conspicuously absent. It leaves a question about where those characters will fall when they are brought back into the storyline. As most know, this movie also introduces Black Panther, which I think is very well played by Chadwick Boseman, and yet another incarnation of Spider-Man, this time played by Tom Holland. In the main battle between the two teams, Spider-Man and Ant-Man (Paul Rudd) very much steal the scenes, both in terms of comedy and with what they bring to the fight.
For those who get the discs, the movie looks and sounds great on Blu-ray. For extras, there is a commentary track on the film by the filmmakers (none of the cast), about an hour plus of making-of and behind-the-scenes material, and a gag reel. There is also a short feature introducing the Doctor Strange movie. Ultimately, this movie is not so complex that you would have no idea what is going on if you have not seen the other movies, but given the movies and, to a smaller extent, the various TV series are all telling a large overarching story, the events of this movie will be easier to follow the more you have seen what has come before. The acting is very good, and the special effects are top-notch. If you have superhero fatigue with all the various movies or are just lukewarm to them in general, then this will probably not be for you. For everybody else, while liking it or not will be subjective, most will find it enjoyable.