Is Rey from Star Wars a Mary Sue?

[Qwark]

Rey is the supergirl of Star Wars, while Luke was batman of Star Wars. Now we all know supergirl by default beats Batman without having kryptonite. Which isn't necessarily bad if it wasn't for the fact Luke had to fight the Darkseid of DC. While Rey merely had to defeat let's say Poison Ivy. Rey isn't just overtly competent the whole new order and what's left of the rebellion is pretty much not competent at all. Except for BB8 (best fighter in the whole new trilogy) and our favourite pilot.

We have a traitor stormtrooper which main quality is that they know which end is the good end of a rifle, but they can't aim, fly or fight for shit. We have a rebellion which never figured out that the new order ships don't have forcefield and shooting a drone at light speed trough their destroyers is enough to defeat them. But I could live with all of the above, the things I couldn't live with are:
Physics a spaceship does not have a huge gravitational pull and you don't fire plasma balls like ducking mortars. If you shoot an object in space to another object shoot it in a goddamn straight line.
Space doesn't know sound so if a fighter flies by we don't need fake noise.
Debris doesn't fucking burn in space or keeps burning (bomber scene)
If you travel to a vacuum you don't need fuel to maintain speed just to keep the lights on.

And finally how was Leia not death, she was blown up, floated in a heavily radiated -200 degree vacuum and still managed to live trough all that, without any explanation at all.