Not too bad a movie. It had a good sense of humor that it kept going throughout the movie. Sure, it made you suspend disbelief a bit more than normal for sci-fi movies, but if you do suspend that disbelief, it's quite enjoyable. I also appreciated its rather surprising lack of gore. They'd take you right up to the edge of an unpleasant death and then pan away so you didn't actually see any gruesomeness. Kudos to them on that point.