Three stars for the music, and two stars for the childish comic elements.
I like the high-tech space themes. It's a team of aliens, rather than superheroes. I also like the cosmic entities. But...
60's/70's/80's hits are cheesy for a space opera. Am I the only one that thinks that? Old hits don't sound stellar. Orchestral/classical and electronic/techno music sound much more stellar and celestial than rock'n'roll.
But I guess the old hits are what Star-Lord is stuck with.
Isn't space opera supposed to have a modern theme? It's supposed to be like Star Trek and Star Wars.
But orchestral music is in this movie. So that's why three stars and not two stars for the music.
If I wanted old hits for a marvel or DC movie I'd have it for a down-to-earth show. Old 70's-ish hits is better for down-to-earth than for out in space.
Michael Giacchino would do great if he made the soundtrack in his style for this.
The worst part of Guardians of the Galaxy is that it's childish and comical. Not mature and serious like say Babylon 5 or Star Trek Deep Space 9.