Stop. If Rey had done this in the film people would have flipped their shit even more. At least Rey demonstrated that she was a fighter during her scene on Jakuu. Luke didn't know anything about fighting before.And being a pilot isn't some super special ability. I wish people would stop using it in their arguments. "OMGBBQSAUCE HOW DID SHE FLY DA FALCON!!!!?!?" No one freaked out at Poe for flying a Fighter for the first time. Oh wait a tick....Poe piloting a Fighter actually mirrored Rey piloting the Falcon; shaky start, then figured it out....AMAZING RIGHT?
The most important thing several people have demonstrated thusfar is that they do not understand the force and how it works. The force doesn't make you strong, doesn't make you a better fighter, doesn't make you a great pilot. The force is an intangible thing that connects and balances the universe, which some individuals can connect with and use it to guide them. It's not like some kind of power up.
The thing about Jedi's is not their ability to use the force. It's their training and journey to MASTER use of the force. You'd think they Rey started flying they way people are acting. She used the Jedi mindtrick, which, based on history, is not some super crazy ability you have to train for years to learn. And she used force pull, again, something that's a commonality among force users of all kinds.
Now onto, "BUT ZOMG SHE BEAT REN!! BUT HOWZ!! HE'S A MASTA!!!" Ren isn't even a matured Force user and there are several BLATANT flaws in his own character that explain why he loss. It wasn't, "He's weak and she got a power up". It was a combination of his own flaws (he's hubris, his self doubt, his fear), combined with Rey letting in the force (Maz confirmed that the force was strong in Rey and was able to see that Rey was simply not letting the force flow through her).
What's funny, is that Ren actually dominated Rey in their first encounter, fully healthy, not distracted by anything. Had that been the case in the final scene, he would have dominated her again. But let's pull back for a second; his intent in the fight wasn't to kill her. He wanted to lure her to his side. He wasn't even attempting to go all out. Had that been the case, she'd be dead.
But here's the best part. We get more movies to explore both characters. And I can't wait serve crow to all the naysayers crying out "MARY SUE!!! ARRRGHHH!"