The difference between the Guardians and a similar group, like The Avengers, was that these folks would hardly call themselves heroes.
Guardians of the Galaxy told a similar story to many superhero team-ups; a group of clashing personalities figures out how to work together in order to save the day.
Eventually, though, they managed to work together to literally save the galaxy. Now they’re at it again in the upcoming Guardians of the Galaxy 2.
“There are a few members that will be helping the Guardians out along the course of this movie.