Are you kidding! The guy launches himself into space to give his special helmet to a girl he barely knows to save her life while putatively sacrificing his life.
That there was some hard core character development!
Don't get me started on the group holding hands to withstand the effects of the infinity stone, team-building that would do Coach K proud!
Oh, and Groot! How did the Academy overlook Vin Diesel for his voice work?
In truth, I enjoyed the movie, in good part because it didn't take itself too seriously, and probably primarily because of the soundtrack.