Normally I try to avoid 3D movies like the plague that I think they are

and go to the 2D showings of the same movie. When bringing kids to some of the recent blockbusters and they want the "day out" experience of 3D, then I end out having to endure the generally DIM & Murky versions of movies that have little of value added to them by 3D
However, IMHO Gravity is all about trying to give the Viewer the experience of being in Space and to allow them to experience the disorientation effects caused by Zero-G and the Vacuum that is Space
And IMHO, the 3D version of Gravity is noticeably superior to the 2D version (I've seen both) in achieving its aims of transporting its Viewers into "Space"
While the Plot is passable and enough to maintain viewer interest for the 95 minutes, the long 3D Takes as Bullock navigates her way thru the zero G of the International Space Station and other Takes that seamlessly move from outside the Astronaut's helmet to the inside of the helmet and back out again, need to be seen several times to fully appreciate
This is a Landmark film that will be heavily imitated in the years to come and IMHO is definitely a movie to see on the Big Screen and in 3D