Guardians of the Galaxy is a Breath of Fresh Air (in Space!)

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.