One of the criticisms really getting under my skin is the whole "Rey is just a Mary Sue" thing, made by Max Landis among others.
I think that's a horseshit thing to say and frankly, nobody would be saying it if Finn did all the same things Rey did. It didn't bother me in the slightest that she capably fought Ren or picked up on Force abilities so fast because:
1. In all likelihood, she is a Skywalker. Force powers are strong with her, and it literally "awakened" within her.
2. Given her brawl on Jakku, she clearly had fought before plenty of times, with weapons that seem like they give skills transferable to lightsaber combat. And I mean OT grounded lightsaber combat, not the stupid choreographed dance bullshit we saw in the prequels.
3. Kylo Ren is not Darth Vader. He is basically fronting, with incomplete training, an uncontrollable temper, and probably little actual combat experience that isnt against unarmed people he terrorizes. This isn't a criticism, I fucking love that they gave us a complicated and realistic character as a villain, and I think he will totally become much more of a threat.
Rey is no more a Mary Sue than countless other movie protagonists. In other genres or films, her talents here would seem bullshitty. But star wars is fantasy first and foremost, and there is nothing wrong in this context with Rey doing what she did.
I think the thing that qualifies her as a Mary Sue to a lot of people is that there weren't any apparent nods or examples to anything that might establish her as a "chose one" other than her just doing stuff. It's not enough to say "it'll eventually be explained in the trilogy" because three movies do not make up one single body of work.
For instance, in ANH, Luke is told right from the start that his father was a Jedi and a powerful force user. From that point on, it's understandable to see Luke as the chosen one no matter what he does, but the thing is he doesn't do anything well, which makes his development that much more believable. We get 0 hints in TFA of why Rey might be the new chosen one other than her doing everything to near perfection without explanation. Not even a red herring to briefly steer us in the belief that she might be related to Luke, even if that doesn't turn out to be the case in the next film. She just does things well. Even her fight with the thieves on Jakku wasn't particularly skillful. She doesn't really do anything impressive. Her family leaving her on Jakku is just too vague and her suddenly having visions and activating R2 doesn't mean anything because we're always wondering "how?" and "why?"
It sounds like I'm being harsh on Rey as a character, but even I was a little bothered by her sudden skill with the force and ability to fly the Falcon. I mean sure she says she's flown shit and probably recognizes what certain knobs do, but it's THE FUCKING MILLENIUM FALCON. And in the end, I still liked her, I just thought there are a few very questionable things about the character's background.