The fight between her and Kylo quite blatantly shows her losing until the plot ass-pulls her - resonance? - with the force, at which point she wins. The Star Wars series has always gone out of its way to show that there's a great deal more to the lightsaber duels than physical ability. Rey becoming a proficient lightsaber fighter is outta left-field and doesn't make much sense.
And don't compare the wonky choreography from the original trilogy as if it's any sort of empirical evidence. They were quite obviously technically limited by what they could portray on screen.
just trying to dismantle the weird straw man of Kylo Ren (impatient, unstable, maybe not even fully trained) having to be utterly superior - because he was trained by Luke Skywalker (a former farmboy, also never formally trained with the lightsaber) - to someone, who for over 10 years had to learn to take care of herself.
I just don't see the initial gap being all that big to make a rather balanced back and forth so inconceivable. It's no Vader vs. Luke in Empire situation, much more Vader vs Luke in RotJ. Where Vader, too, has the upper hand for the longest time.
That's fair - I can't come up with a decent explanation of why Luke would be a master saber user and teach it to his apprentices - but we don't know exactly what happened to him in the past 30 years, or tie 10-15 years before he had apprentices, so who knows. We don't know why he had apprentices either.
Maybe he "sensed a disturbance in the force" and felt the need to prepare apprentices for a future threat? No idea.
true, which is why i don't think we should dismiss what we do know (her being a good fighter) and call it bad writing / 'plot powers'