The jazz scene wasn't humor at all. I didn't find it funny in the least. I appreciate what they were attempting to do by having Peter strut around town like an idiot. I totally get the point about trying to show how the suit is influencing him. I just thought it was poorly done. During those scenes my friend leaned over and said "Wow, did they just completely give up on this thing halfway through?" He voiced exactly what I was thinking.
Sean's comment is exactly how I felt through the rest of the film.

"You know who dies in this movie?

The fanbase."

Very true. My friend who went with me to see this (he is a huge marvel comics fan, and really liked the first two Spidey films) said that if they milked it enough to make a Spidey four that he would definitly be waiting for the DVD release so he could rent it rather than even bother with it in the theater. He is definitly part of that fanbase which no longer shows signs of a pulse.

When I first read Sean's death of fanbase comment I thought he was joking and being a little too hard on the film, but now that I have seen it, I realize it is actually a real spoiler. Sean, how bout putting some spoiler tags on that comment, you wouldn't want to spoil the ending for anybody.