Why Guardians of the Galaxy is not a superhero movie

Please note that you can probably break any of the following traits of superhero stories to create a one. But break them all? I think not.

A superhero story:

1. Is about heroes and villains whose distinctive clothing sets them apart from ordinary people.

2. Is about characters who are best known to the public by their pseudonyms.

3. Is set on Earth, usually in the present.

Now, what's