Guardians of the Galaxy 3 is my nomination.
The first two movies were great entertainment, if you like the superhero genre that laughs at itself. Also, the music selections (taken from before the Dark Age of Rap) were phenomenal, and helped keep my interest.
The 3rd however...
It seemed like someone looked over the last 50 years or so and selected the WORST examples of non and semi hits to use as the sound track.
I don't like the casting of the formerly villain chick who suddenly became one of the good guys after repeatedly trying to kill her sister.
It is almost as if this last send up was a parody (a mockery) of the first two movies. Hard to believe it came from the same studio.