I do not mind Hoffman (as long as it is limited and a playoff against JJ), and I certainly LOVE JJ's role in all 3 movies, with one possible exception, as you noted.
The buying the camera from the kid (Raimi's daughter?? seriously? wow.. talk about Nepitism) "DURING" *sheesh* the Climatic Battle (as climatic as that TERRIBLE battle was.
Add to that the Stupid reporters DURING the Climatic Battle
THAT.. is where Raimi NEEDS to be serious. Like the ending battle in SM1. Awesome, with the only exception of Dafoe's Add Libing (should have been CUT Raimi).
Humor, from JJ (even with Hoffman), and from Spidey (at NON DRAMATIC FINAL Battles) is all fine and good. Added Quips from Spidey (more sides to himself... GOOOOOOD.
JJ and some Smuck Kid (Anytime.. ) but espically during the "climatic" final scene... BAAAAAD

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Leave the DAMN NY'ers out of the DAMN final battle also. AND.. if you have extras (NY'ers) in any battle.. make it like in SM2... During the Doc Ock cafe scene.. WHERE they are ONLY trying to get their ass out of danger's way...
YOU KNOW.. Raimi.. SERIOUSNESS/REALISM.. Not "Cheese"