This may be long. I apologize in advance.
TL/DR version:
I'm more excited when I have no idea how a movie will end, or what exactly is going to happen with the plan of the story. Since we knew how Rogue One ends, I'm making an argument that Episode 7's New Story, is more exciting than an already known story.
First off, Rogue One was AMAZING! I'm not hating on it at all. Also, Episode 7 had it's flaws, but was also a very good movie. It was a blast! My general feeling is a sense of excitement about the unknown.
Television has taken an interesting turn lately. Last several years, many amazing programs have had no problem changing things up significantly, from what you might have expected from a cookie-cutter format. Firefly for example, broke all the rules. And it was probably the best show ever made. Game of Thrones, killed off the main character in the first season - making you realize that you were wrong about the main character - and then they killed off the OTHER main character... and now you are like "Ok I know nothing. I will assume nothing. I will just sit back and see where this story takes me.". This same thing happened in The Walking Dead. A lot of shows have taken me in unexpected directions. I love it! This is also why I HATE Marvel's Agents of SHIELD - It is just so predictable and feels like a show from the 1990s.
Now in terms of movies - I was willing to give the prequels a pass because of two reasons. First off, prequels and backstories weren't common at the time. In fact I think Lucas was the first person to do that, at least the first person I've seen do it that I know of. Also, it was Star Wars - and this made it a big deal. Might have been the last Star Wars we ever got.
But in general, I hate a backstory. We already know how it ends. Sure we don't know every single detail, but if those details were that important we'd probably know them already. Imagine if you watched Empire Strikes Back, and already knew that Vader was Luke's Father - would that entire exchange have the same? I love big reveals. I love huge surprises.
Which brings me to Episode 7.
It's an all new story. (Insert jokes about all of the similarities to the original trilogy here). It is though, it's an all new story. Borrowed concepts aside, we had no idea what was going to happen (Unless you read all the spoilers). They could have done anything. Nobody was "safe". No planets were safe. The Falcon wasn't safe, Chewbacca wasn't safe, Han Solo certainly wasn't safe. You go in to it with mind wide open... and that for me, is magical!
At the end of Episode 7, I was brainstorming on what will happen next. Talking to my friends about who Rey's parents are, what will happen to Finn, who is Snoke, Will Kylo Ren be redeemed... will Rey create a saber staff? This stuff makes me go crazy with excitement! And I'm still just as excited as we countdown to episode 8! (Now less than a year!) It makes me have bigger questions for this entire third trilogy. What is the end-game? Will Snoke be the final bad guy? What will Finn's role turn out to be? Will Luke be the "Nuclear Option" , coming in to save the day at the very end? Will Kylo Ren be redeemed? If so, will it be at the VERY VERY end or will it happen during episode 8 and give us the option to see him as a Good Guy in Episode 9? Did Luke have any other students that survived? Is Thrawn hiding in the outer reaches... waiting for a chance to strike?
When they make a backstory, they put themselves in a box, creatively. There are firm limits on directions they can, and cannot go. Someone suggested a Princess Leia backstory movie, and I feel like that would be a real waste of a film. I feel like we already know so much about her, and the comics and even SW Rebels has filled in enough of the blanks, that we simply don't need a movie there. I feel similar about the Han Solo film, though his story isn't nearly as flushed out at this point. But I'm less enthusiastic about it because we know he cannot die. We know he cannot become horribly disfigured. We know Chewie and Lando also cannot die. (assuming Chewbacca will be in it at some point). We also know that our main characters can't possibly have any major character diversions - IE Han can't possibly become an Admiral in the Imperial Navy, or assume a leadership position in the Rebel Alliance. I get that it will probably be an interesting movie, but I just don't get nearly as excited about any movie where the stakes simply are very very low. At it's most dramatic it might kill off some NEW character/ship/planet that we JUST got introduced to. The stakes are just low.
And that's how I felt about Rogue One. The stakes were crazy low. We knew already that the mission would succeed and the rebels would get the Death Star plans. So all the tension they had in that final battle was completely wasted on me.... because Everyone in that theater already knew the outcome. It was STILL cool, but think how much cooler it would have been if the rebels mission failed, the Imperial Leadership had a change of heart and decided to turn the Death Star against the Empire, and now suddenly the Galactic Civil War is now about the Empire's Fleet versus this new Rebel Death Star? Coruscant get's blown up, and the Emperor is now making an attack run on the Death Star in a TIE Phantom - cloaked so the turbolasers don't see him.
Ok I'm getting a little carried away with that last part... but my point is, stories for me are more interesting when I don't know where they are going with them. Rogue One was a masterpiece, but the fact that we ALL knew how it ends, diminished it somehow. Episode 8 on the other hand, is the incredibly bright light in the future, and my level of excitement for it burns like the core of our sun!
Edited by Crabbok