She's definitely going to tackle temptation and need to grow significantly to triumph in the end, just like Luke did.
What people are suggesting instead is that Rey should turn to the dark side and need to be redeemed, which is something that hasn't actually happened to any major hero in Star Wars that wasn't being set up the entire time for a villain's origin story.
I see it as people wanting Rey to deal with the same struggle as the last 2 main heroes did.
Nobody is extrapolating the significance of her gender. Her gender is significant. Not only across movies as a whole -- because female protagonists are quite rare! -- but because Star Wars has a no good, very bad, terrible, horrible, honest-to-god atrocious history of treating its female characters.
Disagree. Leia is great in the OT.