Originally Posted by
SirCowdog
Using the force can be done, completely untrained, by a child. Using the force WELL, in a deterministic manner, requires some amount of training.
She's doing things that other jedi have been shown to need training to accomplish. Even Anakin(THE CHOSEN ONE!) got smoked by Dooku in their first duel, despite Anakin being trained for years in lightsaber combat. Rey, on the other hand, just gets to beat Kylo in a similar duel because she remembers the force even exists. Granted, Kylo is not on the same level of duelist as Dooku, but he's still been training since childhood. Whereas Rey only picked up a lightsaber for the first time a week(?) before.
And it's important here that Luke said that both Kylo and Rey have similar strength in the force. If that's equal, then the training should make the difference. YEARS of training.
And I think that's where most of the complaints about Rey come from. She's doing a LOT of things(force related or otherwise) that would normally require a lot of training. Only she has no references in the actual story for how she's doing them without it. Some can be handwaved away with "she's strong in the force". But others don't have any real explanation.