I decided to watch this movie after seeing it listed as one of the best sci-fi movies of all time, but I was only partially impressed.
The story was somewhat original, but I felt like there were some holes in the plot that didn't explain some important points (SPOILER: like how exactly the aliens got to Earth, kidnapped the people they needed, and moved them into outer space).
I did enjoy the movie, I just didn't love it. What I did love was the music, by Trevor Jones, which I realized I had heard time and time again, but didn't know was this movie's score.
I also came to the realization that I just don't like Kiefer Sutherland, whose acting always feels forced, fake, and contrived. My opinion of Jennifer Connelly (an Oscar winner, if you can believe it) got a little worse (and it wasn't that high to begin with), as did that of William Hurt (but his started off at a higher level), while Rufus Sewell (whom I previously saw in The Illusionist) does a fairly good job.
No one really stands out, not as much as the landscape at least, which is morbid and scary but also intriguing. The visual effects and makeup are good too, so I guess the score and the technical features are the real success of the movie.
Take it or leave it, it's up to you.