Yes,as well it should be. Any reader of the comic books Civil War knows that the Spiderman /Peter Parker story arc is monumental to the story. His role in my opinion is what the whole story is about. Without a huge spoiler,or knowing how this film is going to represent the books. Where the Hulk and Thor are m.i.a.,mostly(read the comic).
Besides the Iron Man /Cap' configuration through out the whole story. Peter's parts are what the whole storyline is about. Which is basically what happens when everyone knows who's under the mask. To not include this information will be distastes to this film