No. They aren't. That's the point.
Besides which, Fantastic Four sucking doesn't negate the fact that Mr. Fox here is (according to this train of thought) equally as responsible for
Days of Future Past
Fault in Our Stars
Dawn of the Planet of the Apes
Maze Runner
Gone Girl
Kingsman
Home
Spy
Paper Towns.
So how is that explained? How is this single-minded Fox person able to put into production so many different films with varying qualities?
Well, to narrow this down, only two of these are based on comic books to my knowledge.
Also, maybe you missed my edit, I modified my comment to say single mind / group of minds to hopefully clear that up. They're a group of minds that ultimately give a single decision/direction for the movie they want to produce.
So how is that explained? How is this single-minded Fox person able to put into production so many different films with varying qualities?
I think the problem is that they don't have a single-mind controlling their comic book adaptations from an overhead level, which is why we get so much varying quality from their comic book adaptions.