In "Star Wars" Luke Skywalker was the bestest and feircest jedi ever without even knowing what the force is, like Rey was in Force Awakens. So that's a big difference. In the "Empire Strikes Back" Luke gets trained by Yoda and still gets his ass handed to him by Darth Vader. I'm guessing in "Last Jedi" Rey is so powerful that she reverses time and reanimates the dead or something even more absurd. Woo hoo, You go girl!
Luke Skwalker was NOT the bestest and fiecest jedi ever ... crucual omission of NOT in that sentence! Oops.
Rey would have never made a mistake like that. Or any mistake, actually.
I read the funniest article why Rey is NOT a Mary Sue.
Talk about apologetics.
OF COURSE she is a Mary Sue. One of the most obvious and annoying EVER!