I'm a massive Star Wars nerd, and I am sceptic.
* The cinematography of a Star Wars movie should follow certain rules. Scenes in this trailer don't look like that - they look like J.J. Abrams other movies: sweeping shots, shaky cam, teal and orange, lens flares. Oh yes.. Lens flares.
* There have been a lot of books and comics about the events after Return of the Jedi. Guess what - they are no longer valid. Or maybe
something will be put back. We don't know. Anything is up in the air, known only to Lucasfilm's "story team". If you are a long-time Star Wars book reader, then you may get pretty pissed off when you watch the movie. Your favourite characters from the books will probably not show up in the movie - they will probably not even have existed at all in the new continuity.
* If you are a long-time reader of Star Wars books and comics, you will have undoubtedly also have read stories of lesser quality about new superweapons, and got
really tired of such stories to the point that any new story about them would be seen as a joke.
Hey, not even there being a second Death Star in Return of the Jedi was well received by fans or critics.
This new movie will have a
third Death Star ... only that it is not
called a Death Star. (It is not in the trailer, but in the official movie poster)
* If you are a big fan, you will also have seen a lot of fan-films (or even been
in one 
). After Episode 1, you could guess what most of the fan-films have been about: a Jedi and a Sith dueling with lightsabers... and because of budget constraints most of these fan-films have been shot in forests. "Yet another duel in a forest" is often spoken as a joke about fan-films.
In The Force Awakens, there is a new evil character who wears a large black helmet with voice modulator and a long flowing black cloak. That guy and the movie's hero are seen in the trailer about to duel with lightsabers in a forest ...
* The movie was shot in 2D, but is projected in 3D. Not only is there a degradation in image quality inherent in such a conversion. Scenes will have to be framed in a certain way and in a slower pace to even be intelligible in 3D and that constricts the work of the cinematographer.
12% of all people can't experience stereoscopic 3D because of one condition or other - some of them can only see a blur through the glasses. Just as many people get mild head aches or even migraines from 3D. 3D projection is also darker than 2D because of half the light being lost each frame and because bright screens are incompatible with polarized light filtering. There is also "crosstalk" - where one eye sees the frame intended for the other eye superimposed, and vice versa, and that puts people off and making it more difficult to discern details properly.
3D is bad for everyone, but good luck trying to get a ticket to any big screen / 4K projector or IMAX theatre that shows the movie in 2D.
People want to go to see these movies together, and they can't do that when one or more in the party can't see 3D and that pisses people off. Some of the best movie experiences in my life were when queued up to Episode 3 tickets and saw it with my friends. Those days are gone - and will not happen again with 3D.
I will be going to a 2D screen alone, and my ticket is overpriced for what I will get. The image and sound quality in that theatre will not be much better than what I would get seeing the BluRay at home in a few months.
* Where is Luke in the trailer? On Yoda's death bed, Luke had promised him that he would train new Jedi, but where are they? The premise of the movie is on such a downer.
