If they got the science perfectly right, there would be no film.
I disagree. Actual manned spaceflight is dangerous and damned scary as it is. The scenes with the remains of dead astronauts were just freaky. You didn't need a monolithic cloud of space debris, just a few pieces that cripple the shuttle's windows and heat shield. Then what do you do? Houston says they can't launch a rescue shuttle due to the unknown debris factors so your only choice is to chance a transfer orbit to the ISS using an experimental jetpack. Despite the differences in orbital shapes, IIRC the delta-V required isn't that obscene and probably easily written into the capabilities of an experimental jetpack.
You could cut out 90% of the drama in Gravity, and still have a beautiful, compelling, and downright terrifying movie. It's really too bad they felt the need to overdo it.