15 years from now, people are going to pick up this movie and wonder why so many people thought it was bad--there's actually very little wrong with it: memorable performances from Sizemore, Stamp and Kilmer, better science than the average Hollywood flick, a nifty mystery, a logical triumph of man over machine (aren't we all a little tired of omnipotent, indestructible robots?), and crisp suspense as the astronauts race the clock to escape the tightening noose of a mission gone awry.
It was promoted as a SF/Horror flick similar to ALIEN, and it really isn't--it's more like Alfred Hitchcock directing THE RIGHT STUFF.
All the SF movie fans I know tend to like byzantine tales, historic in scope, filled with quirky characters roaming rich new landscapes, so this simple tale of a small group of men trying to escape a desolate red planet within a short span of hours might not be rich enough for them. (The SF fanboys won't like it because Carrie-Anne Moss's shower scene is too short and doesn't show enough...er...Moss.)
It's definitely worth a rental, but you won't want to own it unless you're a suspense fan that revels more in how a film is put together than in how it turns out.