Spider-man 3 was bad. Not just bad, really bad. It is well known to the public that it was a failure to the comic book community for it's inaccuracies. Now, with the rumors surrounding Spider-man 4, I believe that this is the only way to fix the saga...
1) No past changes: Don't fix your past sins, Raimi. I know what you are thinking Sam, don't do it. Uncle Ben's Killer is now Sandman, the black suit makes Peter dance like no one cares, Harry was Two-Face for a few minutes then a ninja Goblin. Its all in the past, make up for it.
2)One villain only: Don't overcrowd us with villains. It provides less time for thorough character and plot development. Look at it this way: Spider-man 1 with one villain: Good, Spider-man 2 had one villain also: Great. Yet, Spider-man 3: three villains= Bad. If it ain't broke, don't fix it.
3) More cameos and villain nods: Let me ask you reader, wouldn't it be cool to see Peter walk past a billboard advertising a Quentin Beck move? Or maybe The Bugle talking about an article about Cletus Kassidy's lock up in Ryker's.
4) LIZARD: We have watched this build up for three previous movies, for god sake give him to us. The CG today cant do it, he is a formidable opponent and he also has a more personal connection to the characters and us.
5) Don't change villains: Vulture aint Black Cat's relative. Never has been, Never will be.
Alright guys, that's my opinion. Until then, I'll be on the Throne. See ya