So during my enforced flu media diet, when I try to watch dumb movies (and occasionally a few not-so-dumb movies) that I pick pretty much at random, I watched Love and Monsters, all three Equalizers, Lucy, Sick, Flash, Blue Beetle, and Rebel Moon. (I also watched Asteroid City, but that was a good film).
Of all of those, Rebel Moon stood out for being breathtakingly dumb. The only one that even comes close is Lucy. Which was a terrible movie (don't even try to think of anything like, "How does the science work?") but at least it had a plot. And, um, interspersed footage from wildlife documentaries. Oh, Luc Besson.
(Side note- Blue Beetle was actually pretty decent. And Love and Monsters, which I had never heard of before, was a fun watch that I would recommend.)