It's not because I feel she is one, it's because she is one.
She flies a large unwiedly freighter with mastery that even had the previous owner in awe...after never having flown it before.
She repairs the ship when seemingly her own skill is locating pieces for salvage
She doesn't even know she is force sensitive and she uses complex skills after closing her eyes and taking a deep breath
She never even used a lightsaber and easily defeated a trained Sith by closing her eyes and taking a deep breath, just like above
She is practically able to raise a mountain, once again with no training at all
If all it took was a 10 second upload then why did all Jedi and Sith spend decades training their apprentices? Why don't they just upload their knowledge and be done with it?
If all it took was having the force to be able to be a master pilot, then why did Anakin lose all his pod races till the one he did win? With Jedi being instant masters he should of been a pod racing master and won enough to buy him and his mother's freedom.
She is a Mary Sue....she had everything handed to her with no skill or training...even when she was seemingly "in danger" something happened and proved she was never in danger in the first place.
So sorry....it's not opinion it's fact.
"A Mary Sue is a character who is so perfect that he or she warps the world around them to display their perfection. It seems as though nothing in this universe except Mary Sue is even real, and is instead a plot device to make Mary Sue seem flawless and loved. A Mary Sue can destroy a piece of writing or media, since the characters existence will often forcibly make the world and people around them defy logic to simply display how amazingly radiant they are. "
Rey does this...she warps the world around her, warps the force so with no training at all...she also destroys the Disney Trilogy because all of the other characters are extraordinarily bad just to make her look better.
Captain Phasma was a character with great potential but was made into a joke
Rose Tico was badly written and dressed like a potato sack, made to look ugly (She is adorable IRL) so Rey looks better
Admiral Holdo was a fucking moron, once again makes Rey look better
Finn had great potential, but completely undid his development in TLJ so he was back where he started and then Rose killed his moment (And in their infinite wisdom made the black man the janitor)
Poe was basically emasculated so in the end he looked dumb and Holdo even dumber
Basically every character in the movie looks stupid so Rey looks ever more smarter and more radiant.
Mary textbook Sue, not my fault you can't accept it.