Gravity belongs to the genre known as "one damn thing after another". Unlike most movies in this genre though, the question is not "what else can go wrong?", it's "How did she stay alive this long?"
The movie takes place in space, specifically high earth orbit. That is a hostile environment with little margin for error. After the Russians destroy som malfunctioning satellites, space becomes outright aggressive with a cloud of debris that the protagonists encounter every 90 minutes.
A great deal of the movie is CGI but you would never know it to look at it. Space lends itself to CGI. Because so much of it is CGI, this is probably the best animated movie ever made.
There is no question that this will get numerous Oscar nominations including best picture, best director, best actress, and best supporting actor. It has a good chance of winning all of those plus several awards for special effects and sound.
If it is nominated in the animated class then Pixar doesn't stand a chance.
Be warned that this movie will probably not hold up on the small screen. You need to see it on a large screen in a blackened room, preferably in 3D.