I don't think anything needs to specifically be "fixed". I liked Spider-Man 3 personally. It isn't my favorite of the series, and I do see its flaws, but on the whole it could have been worse. It's nowhere NEAR Batman and Robin levels of bad. I do agree that Spider-Man 4 needs to be a better film. It needs to be a darker film while not staining the character himself. Spidey isn't Bats. He isn't a dark character at his core, but the situations he finds himself if can be. And that's the sort of thing we need. Another thing is Mary Jane needs to not be captured by the villain. Sam should have used the original idea of Gwen being the one captured by Venom. It would have made more sense, since Gwen was Eddie's girlfriend (in his mind, at least, if you've read the novelization. Spidey 3 would have been better had it been closer to that). Sure it's suspenseful to have the girl Peter loves be in peril, but three times in a row is too much. Try something different. Something new. In this day in age where intelligent storytelling and movies with heart have been pushed aside for generic plotlines and cookie-cutter screenwriting, we need a change. I pray Sam has learned this and Spider-Man 4 blows everyone away like Spider-Man 1 and 2 did.