Guardians of the Galaxy is not a Marvel property I'd ever encountered in written form, but presumably it's similar in tone to the movie, which is snappy, irreverent and by no means takes itself seriously.
Light fun, a bit of mystery behind the main character, fun use of music. I'll see the next one.
Still, there's some dreary 'background' sexism. A lot of it is caused by the main character's 'disposable' attitude toward women, but with the exception of Glenn Close's planetary leader character, all the other women are victims (or crowd-scene Mums). This includes Gamora and her sister, whose plotline revolves around their monstrous father. And for someone theoretically so kick-ass and competent, Gamora sure needs rescuing a lot.
The previews before GotG included Teenaged Mutant Ninja Turtles (which looks amazingly sexist) and The Maze Runner (I'd heard of the book, but didn't know all the people in this maze were boys, with the exception of a late showing-up and connected to the main character girl).
All the Smurfette Syndrome I've been encountering lately seems to be impacting on Pyramids. I usually aim for 50/50 split of M/F characters (with occasional other), but Pyramids is coming out more 20/80.