I cant fault Spider-Man 1 and 2. The reason why 3 was weak because they had by then run out of ideas,and they were all pretty certain it was the end (especially when Dunst accidentally revealed it was the last).
I feel for this reason, they didnt put too much consideration into the movie. It was basically nearly all throughout "Hey guys,since this will be our last,lets just **** about and have fun". That was clearly shown.
You could predict what 4 wouldve been like.
Peter narrating about how life is getting better.
Peter befriending Adrian Toomes and his daughter.
He turns evil becoming Vulture,dies early on,resulting in Felicia Toomes (whatever) becoming Vulturess to avenge daddy's death.
MJ kidnapped,Vulturess sacrifices herself and saves everybody. THE END.
Side plot. MJ continuing with her career. JJ giving up the Bugle,following his humorous exploits in retirement (Sitcom style),then getting the place back.....