Raimi hasn't let me down. But bringing Gwen Stacy in at this time is bad mojo. It doesn't look like they have any plans of wrapping this up. I thought it was a trilogy - to end with III. Looks like money wins again, and I'm afraid the franchise will suffer for it. Everything has built up to Mary Jane. I can handle Harry as Green Goblin/Hobgoblin - but that should be the big end battle with an extra villain or two thrown in the mix. End battle. End of Oscorp. End of trilogy.
So does Mary Jane get wasted? I guess so. Weak way to end two movies of build-up.