I am not much of a Marvel movie fan, although I did grow up reading the comic books. Despite all the action and special effects, I find the movies to be weak. The typical Marvel movie plot revolves around people struggling with deep internal issues and conflicts simultaneously trying to cope or control pressing exterior issues. Both sets of conflicts manage to get resolved during the four and a half hour action extravaganza battle at the end of the movie before the credits and post credit scenes.
While GoG,vol 3 doesn't deviate significantly from the formula, it hits in a powerful emotional spot. Aside from the action, the humor, a killer soundtrack taken from mix tapes I made, and after creating their version of a family in volume 2, the Guardians begin wrestling with the question of what makes a home. This is where the film was particularly effective as the characters struggle with naming difficult emotions and attempting to communicate with each other. Both Gamora and Mantis have scenes where they deliver lines with intense emotional wallop.
Emotional content aside, this movie has plenty of very intense action moments and sensitive people should consider checking doesthedogdie.com before watching it.