Both sides are to blame. Sony for forcing characters on Raimi and Raimi for going out of his way and showing us how much he really dislikes the symbiote.
^
Raimi could of done 100% better with what he had to work with.Instead he kinda screwed himself and fans with screwing certain things up on purpose.
1.By making Sandman uncle Ben's killer and by having him get his powers by falling in a hole when he is running from the cops were two things that he did that screwed the character up.The third thing he screwed up on with Sandman was how he is a good guy at the end and flies away.
2.New Goblin was a slap to the face for Goblin fans.He could of gave fans a real GG costume with a latex mask.He could of even gave us Hobgoblin with the latex mask.Instead he screws that character up by giving us a paintball mask and a flying snowboard.
3.Raimi should of went with the dark theme this movie was suppose to have and make it darker,but with how he did things with Sandman and with the Goblin he ended up making it cheesy instead.
He could of gave us a cool Goblin costume wearing Harry fighting Peter and the clothline scene could of paralyzed Harry from the neck down,which would of kept Harry evil and we could of got rid of the cheesy amnesia stuff.
Then we could of gotten a better Sandman transformation where Harry creates the Sandman,a thug spidey has thrown in prison with Oscorp technology to kill spidey.
4.Then Raimi could of had Sandman vs Black Spidey,one on one,where the black suit gives spidey the advantage to fight a villain like the Sandman.And the black suit could of gave us a more darker feel as black spidey pours cement onto Sandman putting an end to him.
5.Then we could of had one final battle with black spidey fighting GG2/Hobgoblin where black spidey decides to kill Harry for creating Sandman to kill him.And through out the movie we see Harry is being healed more and more.
By the time black spidey shows up at the Osborn mansion,Harry is in the Goblin's lair when the alarm goes off showing Harry on the tv monitor that the intruder is black spidey.
So Harry suits up and we see a kick a## fight where both Harry and Peter is really trying to kill the other.Then it ends when black spidey chucks the pumpkin bomb at Harry and Peter and the audience thinks that Harry is dead.
The reason for the church scene and why Peter takes it off,and we get a glimpse of Venom before the credits go by.
This movie could of been better than anything that we ever saw...