So I just saw this in 3D, and came away mightily impressed.
I'm aware Sandra Bullock is considered by some to be the kiss of death for a movie, but it was the character she played I was annoyed by, at least until she found some gumption about 2/3 through the flick... anyway, I guess it was necessary to the story.
Clooney, as ever, was hugely charismatic, but the two leads were bit parts next to the environment 600km up and the absolutely stunning effects and nightmare scenario.
Here I was thinking CGI has taken the magic out of movie effects, but no - I'm wondering how Alfonso Cuarón and company managed to do an entire film in apparent zero-G without CG-ing the whole thing. Damn impressive.
If 3D doesn't bug you it's a no-brainer for this one. Felt like I'd got my money's worth after only 20 minutes. Utterly spectacular, and I shit you not - this is easily one of the five best thrillers I've ever seen.