Loved it, always did.
Face it, every single alien movie is completely different from one another. And I mean completely. In feel, in message, in pace. everything. And thats how it should be done.
Cameron was a genius not trying to do the same thing over again and instead do a completely different standalone movie. And Fincher did the same - A3 is unlike the other two, not one bit which is great.
Inspired by maledro's posts, i got A3 quadrilogy version yesterday. The reason I never got the full quadrilogy (I always had the first two movies from quadrilogy tho) is because I have NO intentions to ever see the abomination that Ressurrection is ever again. A3 I always wnated to get just couldnt find it anywhere (hate oredring online - hate waiting)
Anyway, going around I see the #1 reason people are pissed about it was because of killing all the other characters. As heartwrenching as it is, like someone else pointed out in this thread before, it was necessary because those characters belonged to Aliens, and Alien3 is a different animal. Besides, that horrific event helped to set the tone of the movie right away.