Beautifully done. I loved that it was very technical.

Rating: 9/10 (29 December 2013)

Normally I would have given this an above average mark, but not too large. The thing that made me grade it with a 9 is the decision to stick to technical details even if, as my wife proved it, some viewers might be put off by them. So, if you imagine that a movie with Clooney and Bullock must be a romance, don't go watching this film.
The film is almost like a screen play with a lot of special effects. Practically there are only two actors, Sandra Bullock being the lead and George Clooney a supporting actor, with a few other actors voicing mission control and so on. The film is only superficially an action movie with the characters fighting for survival, with the real story the interactions of people with outer space and the feeling of isolation one gets over there. In order to fully understand the physics and orbital mechanics, I would direct you to (a lot of) space blog posts from specialists discussing and praising the accuracy of most of the concepts in the film.
As for my subjective point of view, I liked the movie, but mostly because I am a space buff. Some of the scenes - like the one when Clooney untethers - were pointless, while others over the top with special effects and way too loud music. The soul of the movie, though, stands up to scrutiny and I am really glad Cuaron made the effort to bring his vision to the big screen.
A lot of people recommended watching the film on the big screen in 3D. I did not have the opportunity, so I saw it low res on my computer. It's just as awesome. Perhaps for less technical people or uninterested in space, it would not be so pleasing. My wife did not enjoy it. For me, most of the concepts in the film were already known, but it was damn nice seeing them on the screen like that.