Just seen it yesterday. The depictions of the hardware and the general views from orbit are all superb, but even assuming for the sake of the plot that the space stations and Hubble have been moved to similar orbits, the problems of rendezvous are brushed under the carpet. For most of the time the dynamics of interacting objects are good, particularly the tethered ones, apart from where the plot requires that they be ignored. The unconventional rocketry brought into use when the conventional stuff fails would again give a lot more problems than shown.
Enjoy it for the spectacle and the superb use of 3D, but as with a lot of films, you just have to suspend your disbelief here and there.