I always liked Alien 3, despite its sad ending (actually, that still worked for me, and the score is smegging beautiful https://www.youtube.com/watch?v=w1bd9L5Tw7k&list=PLCF78A6D4F54F01DA ), and knowing from what troubled origins it came makes me appreciate it even more. I do remember that Sigourney Weaver said it felt like God was giving her the role of Queen Isabella in 1492: Conquest of Paradise to make up for the sheer hell of shooting Alien 3.
Now, Alien Resurrection on the other hand...
There is one thing that does not, and never will belong in an Alien movie, and that is humor.