This movie was a supreme showcase of spectacle on both the visual and sonic front! For those who think it's just about amazing visuals, it's not. Yes the visuals were amazing - not from a technical perspective necessarily, but just the sheer immersiveness of putting the audience into space as well. It absolutely and totally felt like I was in space and experiencing everything along with Sandra Bullock. And the shots of Earth were just absolutely stunning.
I have to give the sound supreme kudos as well - there was a Dolby Atmos ad before the movie about how it uses speakers in the ceiling (!), and the sound in the movie indeed came from all directions, including from above! The movie also made use of appropriate sound levels with respect to distance, along with silence, as already mentioned. Not hearing explosions in space was definitely new and awesome.
And the movie was just flat-out intense. It made space look scary too and not like a place that most people would want to be in.

In the same way that Life of Pi made me fear the ocean, Gravity made me fear space....
Overall I have to give this movie the most kudos for being the first scientifically-accurate movie set in space! For once, it was an intelligent movie that didn't cheap out on any of the science (physics primarily, of course) and it was amazing to watch and listen to. Highly recommend that folks see this on the largest screen possible that also has the Dolby Atmos speaker system - because the sound was equally amazing! No home theater in the world is going to produce sound like the Dolby Atmos that I experienced!
I'll admit that the trailers didn't sell me on the movie either, and I only went to see it because of all the highly positive reviews. But now I'm a huge fan of this movie. Definitely one of the best of the year for the sum of its visuals + sound + scientific accuracy + intensity + filmmaking style.