The worst I’ve seen this decade is unquestionably The Last Jedi. One of the most insultingly moronic and smug films I have seen in recent memory, and one where all of the logistics in the script are completely non-existent. Each character from the original films is belittled covertly or overtly, the tone is all over the fucking place, and the acting is almost entirely dreadful (Gleeson is hammy as fuck, Daisy Ridley is about as bland and vacuous as it gets, Isaac and Boyega are stuck playing idiotic caricatures, and Driver’s character is so schizophrenic that it hinders his performance considerably). It’s a film that I would cite as a clear endorsement of the postmodernist philosophy that seems to influence so much of modern media (the contrived sentiment of “letting the past die”, which Kylo, Luke and Yoda all accept for no discernible narrative reason, is exemplary of this). There may be more technically inept films made this decade, but none are smug, self-congratulatory yet simultaneously anti-intellectual as The Last Jedi.
I can’t really say concerning the rest of the decades. I might need to think about those for now.