I'm usually just into my sci-fi for big bangs and spaceships. Almost a bit miffed to find myself thinking of the many themes in Gravity for days afterwards. I really enjoyed the closing scenes I realised later. She's a different lady ready to drag herself out of water and breath like the first amphibians - ready to live and not take it for granted.
Sound was great too actually. Love the way ambient sounds gradually came back as air pressure came up etc.
Not so sure about the orbits of all the stations - I think in reality even the spaceshuttle wouldn't have enough delta V to get between Hubble and ISS for example. Hey, but its fiction!
Was wondering if I'd get a chance to see it in IMAX 3D when in Sydney last week but couldn't get there alas.