Along with writing Jumper, This Means War, Days of Future Past, Fant4stic and Apocalypse, Kinberg also produced those movies. So unlike many MCU films where the writers are simply hired guns carrying out the will of the studio, Kinberg was one of the driving forces behind those films. I highly doubt he would continue to work on these movies if he wasn't at least partially happy with the way they turned out. You make it sound like he's being forced at gunpoint to write these films in ways he disagrees with, and the evidence simply isn't there to support that claim. If he's such a talented writer, why does he consistently work on bad movies?
And while he was correct in calling out Apocalypse for being "about global destruction and visual effects over emotion and character," that's still not the only reason why that film was horrible. Because the truth is the film did have character moments in it (Magneto & his family being the most prominent), they were just handled very clumsily.
I also think you make too much of him not writing many of his films by himself. There are a lot of benefits to having co-writers, like having someone to bounce ideas off of, or to collaborate with to make your dialogue and writing better than it would be on your own. Because xXx 2 was all his, Mr. & Mrs. Smith was all his, Apocalypse (aside from an outline) was all his. And all of those films were at best mediocre if not outright awful.
Even if the writer isn't making all of the story decisions, their job is still to make the script the best they can. If Kinberg had any major issues with ideas that were not his he should've left the project, or if that wasn't possible than at the very least not work on the sequels. But he's done the opposite of that, and the only people who have worked on more comic book projects than him are Kevin Feige and Avi Arad.
There's a lot of gymnastics being done by you and others in this thread to place the blame on everyone but Kinberg. I guess we'll find out in November whether he's the write man for this franchise or not.