When did Rey ever express her desire to be a Jedi? Is it because she gives Luke his light saber at the end?
I've seen the movie more times than I can count, but I can't recall a single moment where Rey declared "Oh boy, I can't wait to leave this dusty rock so that I can become a Jedi!"
Rey isn't Luke. She doesn't have the same desires as Luke, despite living on a similar desert planet. From what the movie shows and tells us, Rey would have been 100% content to stay on Jakku, awaiting the return of her family. She showed an aptitude for spelunking and mechanics, but overall, she wanted to stay put. BB-8 dragged her into his mission, and she reluctantly agreed to help him at least find Poe, who BB assumed was alive and on the planet. Then she comes across Finn, and believing that he's a Resistance member, agreed to get him and BB-8 to the resistance base.
She didn't want to join the Empire or Rebellion like Luke, and she certainly didn't want to become a Jedi. She thought they were fun, romantic stories she clearly liked to hear about (she lights up when Finn mentions Luke Skywalker, and they meet Han Solo). She didn't even realize she was Force sensitive until halfway through the movie, and she runs away from the revelation. She wants no part in it. It's not until she begins to tap into the Force that she begins to accept her abilities. That still doesn't mean she wants to walk the path of the Jedi, but she probably sees Luke as exactly what he is; the last known and living Jedi, who may be able to instruct her on how to use her abilities, not train her to be a Jedi.
I mean, why wouldn't you seek the guidance of the one other living person you know who has the same powers as you, that isn't a sociopath that murdered the nice old dude who thought you would make a nice addition to his crew? I'd seek out Luke too. I find Rey interesting exactly because her story trajectory doesn't appear to be the same as Luke's, although folks love to parrot the "OT retread, lolz!" every chance they can.
Since Poe was originally supposed to be killed off at the beginning, I think he's the least developed of the four leads, but I imagine they'll be fleshing his character out in the sequels now that he's a big hit. Finn is also a compelling character, because we haven't gotten to see the ramifications of his defection have barely been tapped. TFA showed Finn waking up from his indoctrination, and reacting to the bigger picture of locating Luke and destroying Starkiller base, but even then, his motivation was to rescue Rey, who was the second most kind person he had ever known.
I can relate to making fast friends with people. I've met folks and within an hour of talking to them, felt like I've known them for years. Poe and Rey treated Finn with no judgment, so I can get how he'd feel an affinity for them, even if he couldn't understand it. The fallout from his defection I think is going to make up a lot of his story in The Last Jedi and beyond.
Kylo Ren is also a super compelling character, and a really different antagonist than Darth Vader, or any previous series antagonists. I thought he was well developed, and executed, and not a Darth Vader 2.0 (although I'm sure he'd have loved to have been held in that regard). In another thread I posted about what I think of his arc and story trajectory, so I won't repeat myself here, but I will say I don't see redemption as the end game for him. He's not Vader. That was his whole arc in TFA. By the end of the trilogy, I think that's going to be hammered home big time. I really dig his character.
I just don't think that Rogue One had as strong of a handle on its characters as TFA did.
