As others have said, he relies too much on "inter-connectivity" and nostalgia. He rides on the coat tails of things created by his mentor Lucas - The Clone Wars in particular, and got seriously attached to some things, and refuses to recognize when it is time to put certain stories and characters to rest, instead having them go on forever and ever, when they no longer serve organic purpose to the narrative and their stories and character arcs just stagnate and are no longer potent. Case in point: Ahsoka most prominent, or more recently Ventress. He once said, sometime when "Rebels" was ending, that he doesn't like when the stories end definitely. He likes when everyone lives happily ever after, and the heroes ride into sunset for another adventure, a la Indiana Jones and the Last Crusade. Stories ending and having boundaries is a good thing. Andor and Clone Wars had that: definitive ending points, being Rogue One and ROTS.
He also has become incredibly formulaic, and he is not a very good screenwriter - his dialogue is pretty bad and plotting is weak. Which isn't surprising, since he hadn't written a single script on the original run of "Clone Wars", and even on "Rebels", he wrote only a few episodes. And now, on "Ahsoka" show specifically, he is adamant on writing everything alone. And the result is showing. He doesn't even have a writers room anymore. Which is really weird.
Then there is a problem of him inserting his particular interests into his works, which makes it feel like a fanfic. His affection for wolves being the most cringe and prominent, or forcing Lord of the Rings shit everywhere.
I'd say he is a competent soldier, who can run day-to-day productions on a tight schedule and deliver, when he is being told what to do by an actual creative - which was the case on "The Clone Wars", when he worked strictly under Lucas. But it is clear that he is not a creative himself.