There isn't many people who like this film. Honestly, when I first saw it: I was like, "What the eff?!" But upon subsequent viewings, I became somewhat enamored with director David Fincher's style; he has since gone to notable films, SEVEN and THE GAME.
In a nutshell, ALIEN3 more or less negates everything Jim Cameron had established in ALIENS, and if you view this movie as a sequel you're gearing yourself up for disappointment. However, if you view this film as a science fiction piece with none-too-subtle religious undertones then you might be surprised to find yourself in for quite a ride.
The look of the film, the trademarked beautiful Aliens grunge, in pulled off quite well. The characters (mostly bald White guys with Brit accents) are a little hard to decipher to the passive viewer, but are quite earnest in their acting. Charles Dance and Charles S. Dutton provide some pretty cool roles (if a little heavy-handed in the latter case).
The religious undertones are there; and they may offend some ardent Bible-thumpers (I'm talking about the Christ-like death sequence)--but it's a nice change of pace for the ALIEN films. The first was horror. Second, war. Why not have the third be 'bout religion?
I think it works; but, hey, different squids for different kids (thanks, Steve, for that phrase). All in all: great cinematography, passable performances with a few gems, laughable story, 'bout two hours of late night or Sunday afternoon stoner entertainment.