For me it's Alex Kurtzman.
I mean, look at this guy. https://www.imdb.com/name/nm0476064/
He could be an emoji in his own right, for any time some movie or TV slop is dolloped out that is carefully protected from being called garbage because there are culture war markings on it that make you sound like a chud if you don't like it.
Kurtzman genuinely failed upwards with Star Trek. '09 was a generic action flick but it was cohesive for the most part, but Into Darkness is violent nonsense. Third one doesn't make much money and the film franchise is basically in development hell.
Then he essentially gets handed the entire franchise forever on TV where he makes violent nonsense that falls apart logically if you think about it for more than one second. There have been D&D campaigns made up on the spot with more narrative cohesion.
He also put magic curative blood as a plot point in two of his scripts, basically back to back. He's a hack.