Ok, firstly it is not brilliant nor awful. It is however well acted by the main cast and when you look at their subsequent previous credits you'll understand why. The genre yes has been used before, but this is well directed, the score is fitting (very much like an old John Carpenter score in places) and you actually like the characters portrayed. If you're a seasond sci-fi fan then yes you'll guess the ending but it doesn't matter, the time has gone by nicely thanks to a very well cast movie.
