This review of Gravity is interesting. Its basic point is that Gravity is a flawed movie because Bullock's character is way too weak to be an astronaut in real life.

http://thelmadams.com/wordpress/2013…

I don't agree, because non-astronaut in space with minimal training has been seen in real life - we now have space tourists, and Challenger had a teacher on board. Since Bullock was there as a technical expert and not an astronaut, it fits (she had three experienced astronauts with her too, which she fails to acknowledge)