I'm not sure where I picked up the term, but I think it's really apt in the situation.
Fox worked on issues 5-7, I think. Not that you'd really notice, honestly. All the writing seems about the same, though those two stories are over the top in different ways. The first two are kind of oddly costumed crime syndicate stories, and the second two have more supernatural foes.
Ross Andru is very talented, and I enjoyed his work here, he just suffers from chronological proximity to some of my other favorite artists, like Kirby's New Gods stuff. His style just never seemed to differentiate itself enough to me.
Perhaps I'm also biased because the stuff I grew up loving and that later got me into comics was a lot more gestural or strange (Vess, Kieth).
I haven't read any spider-man he's worked on in sometime, but I'm sure I'll peak at those Essentials eventually. I do think that his style would be a strength there.