The cast is a dream, and they do pretty well playing crusty, larger than life space heroes 40 years later. Some of the special effects are pretty. And that's about what gets it 2 stars.
But the plot and script are full of holes large enough to drive a Soyuz through. Just one -- it's inconceivable that this mission would be flown without a serious set of schematics for the "communication satellite" and probably a gaggle of Russian techies hanging around for reference. Instead, we have the one sinister Russki aparatchik with a secret. It all seems to be handled like a small discretionary fund project, instead of a novel, newsworthy Major Event.
The thirty day buildup for a complex new mission would be hard to swallow using personnel already familiar with the STS systems, but to bring the old guys up to speed on all that's new since they were flying jets, while they're struggling to run laps, lift weights and .. oh yes, hang out in the local bars, get in fights and pick up chicks .. give me a break.
And it doesn't, or shouldn't, require hindsight to doubt the realism of a Shuttle full of holes, with failing systems, bulling its way through the atmosphere to a seat of the pants landing by a backup pilot with maybe a couple of runs in the simulator.
I've had some experience with how STS missions run, had small roles in very subsidiary control rooms and watched how both the major and the bit players work, and while excellent special effects give a feeling of verisimilitude to the scenes in space, the overall feel .. the people, the systems .. just does not have the Right Stuff. For a real gut-level realism, see "Apollo 13"