The James Gunn film is set in a galaxy where the heroes haven't got the superhero profile. Peter Quill is a bounty hunter that was taken away from his planet, the Earth, when he was just a boy. From his planet he only has a walkman with a cassette that has multiple songs. It is noteworthy to say that the nostalgic songs and the reference to the movie Footloose (1984) where Kevin Bacon becomes a hero changing a situation by dancing makes this film different.
As said at the beginning, the characters have all a different profile that you wouldn't identify with a hero. They are selfish, they only look for themselves... When Peter steals something capable of destroying the galaxy from Ronan - the tyrant of the film - Gamora (Zoe Saldana) has the duty to bring it back to Ronan, but she's planning her betrayal. Besides that, the Groot and Rocket want to capture Peter to earn money. This persecution finishes when they all go to jail and have to ally in order to get out of there. In jail, they also find another ally, that wants to avenge the death of his family by killing Ronan, Drax. The allies, all together, start a journey that is going to make they learn what friendship is and that is going to keep you on the edge of your seat because the film does not have boring scenes or great speeches like most of the super-heroes films.
This film is different because the heroes combat their enemies with violence, weapons and spaceships but also with other kinds of things like jokes, puns or metaphors. I think that one of the most remarkable things of this film - probably the most remarkable- is the script and the way the characters are developed. The story itself does not have anything we haven't seen before, but as commented, the way the characters talk and act, makes it unique. The references to music and cinema are also very catchy and funny.