It's impressive but fact remains that he wouldn't have been able to do that without the veterans.

So, we'd have to wait for the movie to see if Rey is really a poorly written character?

Yeah, Citizen Kane and Hamlet are not sci-fi stories with major plot complexities. They're character-driven. You're the one using SW to excuse the major flaws of TFA.

That trailer has some really cool moments. One of them in particular is when a missile from the rebels is shot at the AT-ACT.

Rey may have those abilities for a reason.

All three of Anakin, Luke, and Rey are basically "perfect" characters in their first episodes, it's not until the second chapter that they get some "dirt" on them.

Luke: Training Time: Approximately 5 minutes. Blows Up Death Star and out maneuvers "Chosen One" master pilot Darth Vader to do so. Saves galaxy (?). 

Anakin: Training time - 0 minutes. 9-years-old, races pods (no other human can do this) at 1000 mph, blows up Trade Federation command ship saving the entire planet of Naboo. 

Rey: Training time - 0 minutes. Uses several Jedi maneuvers (Jedi mind trick) with no apparent training, those her past is murky. Beats Kylo Ren, who isn't a "master". Technically it's actually Han Solo and Poe Damoreon who save the galaxy in this movie, Rey basically does nothing but overcome an injured Kylo Ren.

We'll see where Rey's character arc goes.

Luke has like 5 minutes of training too in ANH, lol, it's probable Rey has more actual Jedi training than he does, it's just repressed inside of her or laying latent or whatever. It looks like from that flashback that she's 7 or 8? She could have been training as a Jedi for a couple of years perhaps.

Or there is that reincarnation theory ... which to me wouldn't be so far flung since Star Wars very obviously borrows heavily from Buddhism and Eastern philosophy.

I'm saying we should wait to see what happens in VIII.  Luke and Han's defeats in V are extremely important to character development.  Also, if the Veterans dying qualify as Luke being aufficiently aided to avoid being a Marty Sue (or Gary Sue if you're a rhyming man :P ) then what about Ren being injured?  Both Finn and Chewie injured him before Rey fought him so it's not like when Luke fought Vader in V when Vader was fresh and it was an even fight.  

And all I was pointing out is that great writing has been around for centuries so implying that Star Wars VII should have better writing cause it's the 2010s or waving off the original trilogy's flaws based on it being written in the 1970s is a fallacious argument.

The movie looks good but there is something me that makes me very worried.

The director is Gareth Edwards, the most remarkable things he has done are Monsters (2010) and Godzilla (2011).

Those movies don't have a horrible direction but they are FAR from good. Hope this is his first good one.

Looks more interesting than the last movie. We seem to be getting an original story this time around.