Robbie Reyes’ story is what makes Ghost Rider interesting.
In the end, what makes Ghost Rider an interesting addition to Agents of S.H.I.E.L.D. isn’t that he fits into audience’s preexisting ideas of what the show is about, but rather that he doesn’t.
That’s in the first episode — there is nothing weirder, stranger, more unreal or dangerous than Ghost Rider.
It seems Marvel had those criticisms in mind and made an attempt to address them with the new season.