I don't care that much about Rey's being as good as she was because I really like her although I know that's not the case for everyone. There's almost a pathological hatred of her from some. In movies, it's pretty standard for characters to get a couple of days of training and do stuff that would take years in reality. It goes further with Rey than with most other Star Wars characters.
Luke parried blaster bolts on Day One but, except for the shot at the Death Star, which they set up that he was a great pilot and an accurate shot, was his one big deal after getting tossed around in a bar.
There's no greater grandiose origin than Anakin being born of a virgin.
I mean, wtf? But he still needed massive training to develop his potential.
Proportionate to all of the other three-ring circus stuff in 7, 8 and 9 (and now, for the next amazing thing you won't believe and have never seen before- prepare to be amazed- character x will now do something magnitudes beyond anything you've ever seen in a previous SW movie), Rey is just along for the ride. She doesn't do anything that seems ridiculous when you judge on a curve compared to other Force users in TFA, TLJ and TROS. It's only when you compare her to the previous trilogies and ignore that you could take any character from the last trilogy and they are ridiculously overpowered compared to the previous trilogies.
I also find myself drawn into Rey's emotional journey and feeling sympathy for her. Maybe that's because she's a woman. But I think they did a good job of showing her vulnerability which is hard to pull off with a character accused of being the ultimate Mary Sue.