There is a trope that I love, and it involves that dorky, intellectual who no one believes in that has to overcome every obstacle in order to be The Best or The King or Whatever Title The Prologue Laid Out. Throughout his journey, there is only one person who believes in him. Either his mentor, who inevitably dies, or himself after the mentor's death and a couple hard lessons. You see this trope everywhere because I just described the protagonist for The Hero's Journey. Doctor Strange the movie wants to apply this trope to Dr. Stephen Strange, the character, but misses the mark in a couple ways.
In the previous installments of Captain America, Steve Roger's (Chris Evans) morality was never questioned even though he was defying orders (especially if he was defying orders). He indisputably did the right thing by rescuing Hydra POWs, one of which was his best and closest friend Bucky Barnes (Sebastian Stan). He also did the right thing by taking down SHIELD and Hydra in one fell swoop. Here, he is the crux in the split of The Avengers, not because he rejects the Sokovia Accords, but because he wants to protect Bucky from being framed. It is perhaps the first time Steve's morality is called into question. And it should have been done better.
This is just one reason why Ant-Man differs from the rest of the Marvel Cinematic Universe so far. Another is the low-stakes presented throughout the film. Sure, the Pym Particles falling into the hands of Hydra is something no one wants, but this movie is ultimately about two fathers wanting to do right by their daughters.
You've probably heard it before and I'll say it again, the idea of the Marvel Cinematic Universe is an unprecedented feat of filmmaking that I can only assume requires a lot of organization, a lot of discussion of what is canon and what is not, and clearly defined goals for each and every movie that comes out of the Marvel/Disney machine. The directors for these films work closely with the producers to keep the movie in line with not just the Marvel overlords but also the characterizations of each superhero that appears on screen.
The real story to follow is that of the Infinity Stones. So far, we've encountered a grand total of three: the space stone (Captain America: The First Avenger), the mind stone (The Avengers), and the reality stone (Thor: The Dark World). Guardians of the Galaxy introduces the fourth stone, the power stone. And it does it by also introducing a team of bumbling outlaws trying (and only sometimes failing) to do the right thing. After more than ten movies about people on the right side of the law, we get to follow people on the other side.