I really like where Rey is going as a character.
I love how they hinted at her family in Force Awakens, before revealing they were actually nobody special. I thought it was great that she had that little solo training session on the island, and the audience were expecting her to show some badass light sabre moves, but then she just slices those rocks clean in half like a clumsy fool. I thoroughly enjoyed the way she made that big play about Kylo coming back to the light, but he was having exactly none of that talk. That last one was a cool twist.
The best bit though, for me, was watching her epic failure against Snoke. How little regard or respect he gave her, how he simply played her like a fiddle and was ultimately ready to toss her aside like that used instrument. She meant almost nothing to him.
All these little things (and there are more examples) add up to one of the more interesting takes on the 'chosen hero' character than I've seen in a while. Basically, she isn't the great mover of events that we might have expected her to be. She doesn't really influence people in a special way, she's really got no answers from anybody for any questions that were important to her, and everything she's tried to do has blown up in her face someway.
I think it could be cool if episode 9 were to start with her going to quite a dark place, like she gets resentful in a "Well ok, fuck everything then" kind of way, before ultimately accepting that she's not some superhero destined to forever change the course of galactic history, but rather just a good person who has some power, and so can at least achieve something worthwhile. I thought the last scene, where she clears the path to allow the rebels to escape, kind of hinted that might be her calling.