I DISLIKE Alien3 (not hate) pretty much because of the reasons people have already stated.
I did like the movie as a kid, but now it just doesn't hold up. I'm finding it incredibly boring and irrelevant. It really doesn't add anything to the Alien biology itself.... while ALIEN and ALIENS did. People wanted to see more of the Xenomorph in this movie like they did in ALIENS, but they didn't get that. Instead Alien3 tries too hard to be a character-study with the Alien just as a sub-plot or something. With that in mind, I do think Alien3 is a good, stand-alone movie, but not as an Alien movie.
I kind of think Resurrection AND AVP as Alien flicks are better than Alien3. I would perhaps even LIKE Resurrection if it wasn't for the fact it depends on Alien3 as a prior history.
The plot-holes in Alien3 like how the egg got on board are just too many. I could even mention how strange it is that Ripley KNOWS she has a Queen inside of her. Some of the movies, especially Alien3 seem to give Ripley way too much credit for what she knows about the Alien.... she knows things that some people in her position would simply just not know.