I don't mind that the secrets are given away in the prequels simply because we're not supposed to see them first! We watch the OT. All the secrets are revealed over the course of the trilogy. We're enraptured. We think, "Wow. That's all pretty cool. I wonder how that happened?" Enter the prequels. Like in a mystery novel, this is supposed to be the part at the end where the genius detective shows up and says, "And this is how it happened..." going step by step through the process leading up. It's backstory. It exists only to expand on the original stories, not to be stories on their own.