I know some people still like to hang the third movie's mixed results squarely on Sam saying, "Well he was responsible for making it work" but you can't do that fairly.Simmons: ...strangely he was sort of less on his own in the third film and it kinda felt like there were a lot of cooks stirring the pot in that third film.
Simmons comment here only shows that even the actors were aware of the overt studio hands on involvement for Spidey 3 and how it hurt the film.