Why are people being so dumb?
There is no Green Goblin in this movie. Period.
Considering the scope of this movie and all the things that need to be done there is neither the time nor the plausibility of Harry becoming a full-fledged Goblin. It just wouldn't make sense. Raimi said this himself.
He's just Harry. That's all. Sam Raimi and the production team are fairly intelligent not to dress up a character as a 'Goblin' who doesn't act like one. With Sandman, Eddie, and the black suit would anyone really want to see a repeat of Spider-Man 1's Defoe with Harry?
I was shocked at the negative reaction to the costume. Sure it might not work as a 'Goblin' costume, but it's a million times better than the one in Spider-Man 1. The worst costume for any supervillain ever and they only designed it that way so they could make a toy out of it easily.
The production has done something unique with Harry and they should be commended.