So yea, you're right, the scene I was lacking is there already xD man I hate the pacing of this movie.
Personally, it went against my narrative sensibilities, too. My first post about TFA actually contained that as a criticism. I write novels for a living and I would never get away with that ...
But in the context of Star Wars, Rey fits right in with the main characters of the previous trilogies. Luke is almost the same, in Star Wars he becomes an ace pilot because his father was - that is how fairytale genetics work, after all -, and later he becomes a Jedi Knight in an exceedingly short amount of training. That is OK, space knights need their trusty steeds (X-Wings) and swords (lightsabers), and Luke is basically Percival. Of course, it jarringly contrasts with everything the Prequels tell us, and is one major reason why Yoda is probably the most self-contradictory character of the whole franchise. Anakin is even worse, at least in regard to his mechanical genius shtick, which is neither explained - the Force is about life, not conduits - nor needed and subsequently all but dropped in the later movies.
So, saying that Star Wars has the habit of presenting supremely talented individuals going from zero to hero is OK (as is liking or not liking that), but leveraging that against Rey is not, because of all that came before her. She is just one character in a line just like her, the embodiment of Star Wars traditions.