I'm not generally hugely impressed by 3D films. Either the 3D is used as a gimmick (Duck! There's a hammer flying out of the screen towards you!), which usually means that the script is weak, or you're so engrossed in the story that you don't notice them, so what's the point? However, I have discovered an exception: Gravity. Okay, the two stars (Sandra Bullock and George Clooney) are capable of far more, and there wasn't much story, but the 3D effects really conveyed the strangeness of space, where there is no up or down without another object to refer to. 
I hadn't considered before how fire might behave on a spacecraft, or that there is nothing to slow the momentum of a movement. Elements of the story might have jarred, but not the portrayal of space (apart from Sandra Bullock's hair). Without 3D, I believe the film simply wouldn't have worked.
As all the best films do, Gravity left me with questions. What would have been happening on Earth with so many satellites smashed? Would there have been a defense crisis? Would communications have been completely out of action? Would pieces hitting Earth cause chaos? The results could be catastrophic. There are many other stories that could be told sparked by the same catalyst.
On the whole, Gravity was well worth seeing.