Back to the movie, I thought it was decent. It should be noted though that I have not seen Alien Nation.
I read some of the comments here before I sat down to watch it. The first thing is this isn't the same old Smith as far as I can tell. Sure, he had some of the same old mannerisms that he always does in action movies, but he hasn't really taken the role of a lost soul before. And remember when he said he was above cussing (
). To that end, the production and acting was pretty good.
As far as the world building goes, it could have used some more, and I think the post above with a quick voice-over would have done it.
Groundbreaking? No. Good? Yes.